chore: commit missing files

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 { }