Add project files.

Bitvault.Avalonia/App.axaml.cs

@@ -0,0 +1,17 @@
+using Avalonia;
+using Avalonia.Markup.Xaml;
+
+namespace Bitvault.Avalonia;
+
+public partial class App : Application
+{
+    public override void Initialize()
+    {
+        AvaloniaXamlLoader.Load(this);
+    }
+
+    public override void OnFrameworkInitializationCompleted()
+    {
+        base.OnFrameworkInitializationCompleted();
+    }
+}