chore: commit missing files

PcgsApi/PcgsApi.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+    <PropertyGroup>
+        <TargetFramework>net10.0</TargetFramework>
+        <ImplicitUsings>enable</ImplicitUsings>
+        <Nullable>enable</Nullable>
+    </PropertyGroup>
+
+    <ItemGroup>
+      <PackageReference Include="ReactiveUI" Version="23.2.28" />
+      <PackageReference Include="ReactiveUI.SourceGenerators" Version="3.1.0">
+        <PrivateAssets>all</PrivateAssets>
+        <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
+      </PackageReference>
+    </ItemGroup>
+
+</Project>

PcgsInv/App.axaml

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+<Application xmlns="https://github.com/avaloniaui"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             x:Class="PcgsInv.App"
+             xmlns:local="using:PcgsInv"
+             RequestedThemeVariant="Light">
+
+    <Application.DataTemplates>
+        <local:ViewLocator />
+    </Application.DataTemplates>
+
+    <Application.Styles>
+        <FluentTheme/>
+        <StyleInclude Source="avares://Avalonia.Controls.DataGrid/Themes/Fluent.xaml"/>
+    </Application.Styles>
+</Application>

PcgsInv/App.axaml.cs

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+using Avalonia;
+using Avalonia.Controls.ApplicationLifetimes;
+using Avalonia.Markup.Xaml;
+using PcgsInv.ViewModels;
+using PcgsInv.Views;
+
+namespace PcgsInv;
+
+public class App : Application {
+    public override void Initialize() {
+        AvaloniaXamlLoader.Load(this);
+    }
+
+    public override void OnFrameworkInitializationCompleted() {
+        if (ApplicationLifetime is IClassicDesktopStyleApplicationLifetime desktop)
+            desktop.MainWindow = new MainWindow {
+                DataContext = new MainWindowViewModel()
+            };
+
+        base.OnFrameworkInitializationCompleted();
+    }
+}

PcgsInv/PcgsInv.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+    <PropertyGroup>
+        <OutputType>WinExe</OutputType>
+        <TargetFramework>net10.0</TargetFramework>
+        <Nullable>enable</Nullable>
+        <ApplicationManifest>app.manifest</ApplicationManifest>
+        <AvaloniaUseCompiledBindingsByDefault>true</AvaloniaUseCompiledBindingsByDefault>
+    </PropertyGroup>
+
+    <ItemGroup>
+        <AvaloniaResource Include="Assets\**"/>
+    </ItemGroup>
+
+    <ItemGroup>
+        <PackageReference Include="Avalonia" Version="12.0.4"/>
+        <PackageReference Include="Avalonia.Controls.DataGrid" Version="12.0.0" />
+        <PackageReference Include="Avalonia.Desktop" Version="12.0.4"/>
+        <PackageReference Include="Avalonia.Themes.Fluent" Version="12.0.4"/>
+        <PackageReference Include="Avalonia.Fonts.Inter" Version="12.0.4"/>
+        <PackageReference Include="AvaloniaUI.DiagnosticsSupport" Version="2.2.2">
+            <IncludeAssets Condition="'$(Configuration)' != 'Debug'">None</IncludeAssets>
+            <PrivateAssets Condition="'$(Configuration)' != 'Debug'">All</PrivateAssets>
+        </PackageReference>
+        <PackageReference Include="ReactiveUI" Version="23.2.28" />
+        <PackageReference Include="ReactiveUI.Avalonia" Version="12.0.3" />
+        <PackageReference Include="ReactiveUI.SourceGenerators" Version="3.1.0">
+          <PrivateAssets>all</PrivateAssets>
+          <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
+        </PackageReference>
+    </ItemGroup>
+
+    <ItemGroup>
+        <Folder Include="Converters\"/>
+    </ItemGroup>
+
+    <ItemGroup>
+        <ProjectReference Include="..\PcgsApi\PcgsApi.csproj"/>
+    </ItemGroup>
+</Project>

PcgsInv/Program.cs

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+using System;
+using Avalonia;
+using ReactiveUI.Avalonia;
+
+namespace PcgsInv;
+
+internal sealed class Program {
+    // Initialization code. Don't use any Avalonia, third-party APIs or any
+    // SynchronizationContext-reliant code before AppMain is called: things aren't initialized
+    // yet and stuff might break.
+    [STAThread]
+    public static void Main(string[] args) {
+        BuildAvaloniaApp()
+            .StartWithClassicDesktopLifetime(args);
+    }
+
+    // Avalonia configuration, don't remove; also used by visual designer.
+    public static AppBuilder BuildAvaloniaApp()
+        => AppBuilder.Configure<App>()
+            .UsePlatformDetect()
+            .UseReactiveUI(builder => builder.WithAvalonia())
+#if DEBUG
+            .WithDeveloperTools()
+#endif
+            .WithInterFont()
+            .LogToTrace();
+}

PcgsInv/ViewLocator.cs

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+using System;
+using System.Diagnostics.CodeAnalysis;
+using Avalonia.Controls;
+using Avalonia.Controls.Templates;
+using PcgsInv.ViewModels;
+
+namespace PcgsInv;
+
+/// <summary>
+///     Given a view model, returns the corresponding view if possible.
+/// </summary>
+[RequiresUnreferencedCode(
+    "Default implementation of ViewLocator involves reflection which may be trimmed away.",
+    Url = "https://docs.avaloniaui.net/docs/concepts/view-locator")]
+public class ViewLocator : IDataTemplate {
+    public Control? Build(object? param) {
+        if (param is null)
+            return null;
+
+        var name = param.GetType().FullName!.Replace("ViewModel", "View", StringComparison.Ordinal);
+        var type = Type.GetType(name);
+
+        if (type != null) return (Control)Activator.CreateInstance(type)!;
+
+        return new TextBlock { Text = "Not Found: " + name };
+    }
+
+    public bool Match(object? data) {
+        return data is ViewModelBase;
+    }
+}

PcgsInv/ViewModels/MainWindowViewModel.cs

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+using System;
+using System.Diagnostics;
+using PcgsApi;
+using PcgsInv.Models;
+using ReactiveUI;
+using ReactiveUI.SourceGenerators;
+
+namespace PcgsInv.ViewModels;
+
+public partial class MainWindowViewModel : ViewModelBase {
+    [Reactive] private CoinCollection _collection;
+    [Reactive] private PcgsCoin? _selectedCoin;
+
+    public MainWindowViewModel() {
+        Collection = new CoinCollection();
+        _selectedCoin = null;
+
+        Collection.PropertyChanged += (s, e) => {
+            Debug.WriteLine($"Collection raised event: {e.PropertyName}");
+        };
+        
+        this.WhenAnyValue(x => x.Collection.TotalValue)
+            .Subscribe(x => Debug.WriteLine($"Total value was recomputed: {x}"));
+    }
+
+    [ReactiveCommand]
+    private void CreateTestingCoin() {
+        Collection.Coins.Add(new PcgsCoin());
+    }
+}

PcgsInv/ViewModels/ViewModelBase.cs

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+using ReactiveUI;
+
+namespace PcgsInv.ViewModels;
+
+public abstract class ViewModelBase : ReactiveObject { }

PcgsInv/Views/MainWindow.axaml

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+<Window xmlns="https://github.com/avaloniaui"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+        xmlns:vm="using:PcgsInv.ViewModels"
+        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+        mc:Ignorable="d" d:DesignWidth="800" d:DesignHeight="450"
+        Height="450" Width="800"
+        x:Class="PcgsInv.Views.MainWindow"
+        x:DataType="vm:MainWindowViewModel"
+        Icon="/Assets/avalonia-logo.ico"
+        Title="{Binding Collection.Name, StringFormat='PCGS Inventory - {0}'}">
+
+    <Design.DataContext>
+        <vm:MainWindowViewModel />
+    </Design.DataContext>
+
+    <Grid ColumnDefinitions="3*, Auto, *"
+          RowDefinitions="Auto, *">
+        
+        <Menu Grid.Row="0" Grid.ColumnSpan="2">
+            <Menu.Items>
+                <MenuItem Header="File">
+                    <MenuItem Header="Hello"/>
+                </MenuItem>
+            </Menu.Items>
+        </Menu>
+        
+        <DockPanel Grid.Row="1" Grid.Column="0">
+            <Grid DockPanel.Dock="Top" Margin="5" ColumnDefinitions="Auto, *">
+                <TextBlock Grid.Column="0" VerticalAlignment="Center" Text="Collection name: "/>
+                <TextBox Grid.Column="1" Text="{Binding Collection.Name}" />
+            </Grid>
+            
+            <Button DockPanel.Dock="Top"
+                    Command="{Binding CreateTestingCoinCommand}"
+                    Content="Create Test Coin"/>
+            
+            <TextBlock DockPanel.Dock="Bottom"
+                       Margin="5"
+                       Text="{Binding Collection.TotalValue, StringFormat='Total Value: ${0}'}"/>
+            
+            <DataGrid ItemsSource="{Binding Collection.Coins}"
+                      SelectedItem="{Binding SelectedCoin}"
+                      Margin="5">
+                <DataGrid.Columns>
+                    <DataGridTextColumn Width="*" Header="Name" Binding="{Binding Name}"/>
+                    <DataGridTextColumn Header="Quantity" Binding="{Binding Quantity}"/>
+                    <DataGridTextColumn Header="Price" Binding="{Binding PriceGuideValue}"/>
+                    <DataGridTextColumn Header="Total" Binding="{Binding TotalPrice}"
+                                        IsReadOnly="True"/>
+                </DataGrid.Columns>
+            </DataGrid>
+        </DockPanel>
+        
+        <GridSplitter Grid.Row="0" Grid.RowSpan="2" Grid.Column="1" Background="Gray" ResizeDirection="Columns" Margin="3"/>
+        
+        <!-- Some other content -->
+        
+        <DockPanel Grid.Row="1" Grid.Column="2">
+            <TextBlock>This is a test!</TextBlock>
+        </DockPanel>
+    </Grid>
+
+</Window>

PcgsInv/Views/MainWindow.axaml.cs

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+using Avalonia.Controls;
+
+namespace PcgsInv.Views;
+
+public partial class MainWindow : Window {
+    public MainWindow() {
+        InitializeComponent();
+    }
+}

PcgsInv/app.manifest

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+<?xml version="1.0" encoding="utf-8"?>
+<assembly manifestVersion="1.0" xmlns="urn:schemas-microsoft-com:asm.v1">
+    <!-- This manifest is used on Windows only.
+         Don't remove it as it might cause problems with window transparency and embedded controls.
+         For more details visit https://learn.microsoft.com/en-us/windows/win32/sbscs/application-manifests -->
+    <assemblyIdentity version="1.0.0.0" name="PcgsInv.Desktop"/>
+
+    <compatibility xmlns="urn:schemas-microsoft-com:compatibility.v1">
+        <application>
+            <!-- A list of the Windows versions that this application has been tested on
+                 and is designed to work with. Uncomment the appropriate elements
+                 and Windows will automatically select the most compatible environment. -->
+
+            <!-- Windows 10 -->
+            <supportedOS Id="{8e0f7a12-bfb3-4fe8-b9a5-48fd50a15a9a}"/>
+        </application>
+    </compatibility>
+</assembly>