Add project files.

Hyperbar.Desktop/App.xaml.cs

@@ -0,0 +1,37 @@
+using Hyperbar.Desktop.Controls;
+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.Hosting;
+using Microsoft.UI.Xaml;
+using System;
+
+namespace Hyperbar.Desktop;
+
+public partial class App : 
+    Application
+{
+    public App() => InitializeComponent();
+
+    protected override async void OnLaunched(LaunchActivatedEventArgs args)
+    {
+        base.OnLaunched(args);
+
+        IHost? host = Host.CreateDefaultBuilder()
+            .UseContentRoot(AppContext.BaseDirectory)
+            .ConfigureServices(args => 
+            {
+                args.AddTransient<IInitializer, AppInitializer>();
+                args.AddTransient<DesktopFlyout>();
+
+                args.AddTransient<ITemplateFactory, TemplateFactory>();
+                args.AddTransient<ITemplateGeneratorFactory, TemplateGeneratorFactory>();
+
+                args.AddDataTemplate<CommandViewModel, CommandView>("Commands");
+                args.AddDataTemplate<ContextualCommandViewModel, ContextualCommandView>();
+
+                args.AddHostedService<AppService>();
+            })
+            .Build();
+        
+        await host.RunAsync();
+    }
+}