Add project files.

WinGreedWPF/App.xaml.cs

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+using WinGreedWPF.StartupHelpers;
+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.Hosting;
+using System.Windows;
+using WpfLibrary;
+
+namespace WinGreedWPF;
+
+public partial class App : Application
+{
+    public static IHost? AppHost { get; private set; }
+
+    public App()
+    {
+        AppHost = Host.CreateDefaultBuilder()
+            .ConfigureServices((hostContext, services) =>
+            {
+                services.AddSingleton<MainWindow>();
+                services.AddFormFactory<ChildForm>();
+                services.AddFormFactory<ExtraChild>();
+                services.AddTransient<IDataAccess, DataAccess>();
+            })
+            .Build();
+    }
+
+    protected override async void OnStartup(StartupEventArgs e)
+    {
+        await AppHost!.StartAsync();
+
+        var startupForm = AppHost.Services.GetRequiredService<MainWindow>();
+        startupForm.Show();
+
+        base.OnStartup(e);
+    }
+
+    protected override async void OnExit(ExitEventArgs e)
+    {
+        await AppHost!.StopAsync();
+        base.OnExit(e);
+    }
+
+}