chore: commit missing files

PcgsInv/App.axaml.cs

@@ -0,0 +1,22 @@
+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();
+    }
+}