Added UI app.

MangaReader.WinUI/App.xaml.cs

@@ -0,0 +1,37 @@
+using MangaReader.WinUI.ViewModels;
+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.UI.Xaml;
+using System;
+
+namespace MangaReader.WinUI;
+
+public partial class App : Application
+{
+    private Window? _window;
+
+    public static IServiceProvider ServiceProvider { get; private set; }
+
+    static App()
+    {
+        ServiceCollection services = new();
+
+        services.AddSingleton<MainWindow>();
+
+        services.AddSingleton<SearchViewModel>();
+
+        services.AddMangaReader();
+
+        ServiceProvider = services.BuildServiceProvider();
+    }
+
+    public App()
+    {
+        InitializeComponent();
+    }
+
+    protected override void OnLaunched(LaunchActivatedEventArgs args)
+    {
+        _window = ServiceProvider.GetRequiredService<MainWindow>();
+        _window.Activate();
+    }
+}