Add starter and complete projects for ch 7

Chapter07/Complete/MyMediaCollection/App.xaml.cs

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+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.Hosting;
+using Microsoft.UI.Xaml;
+using Microsoft.UI.Xaml.Controls;
+using Microsoft.UI.Xaml.Navigation;
+using MyMediaCollection.Interfaces;
+using MyMediaCollection.Services;
+using MyMediaCollection.ViewModels;
+using MyMediaCollection.Views;
+using System;
+using System.Net;
+using System.Threading.Tasks;
+
+namespace MyMediaCollection
+{
+    /// <summary>
+    /// Provides application-specific behavior to supplement the default Application class.
+    /// </summary>
+    public partial class App : Application
+    {
+        public static IHost HostContainer { get; private set; }
+
+        /// <summary>
+        /// Initializes the singleton application object.  This is the first line of authored code
+        /// executed, and as such is the logical equivalent of main() or WinMain().
+        /// </summary>
+        public App()
+        {
+            this.InitializeComponent();
+        }
+
+        /// <summary>
+        /// Invoked when the application is launched.
+        /// </summary>
+        /// <param name="args">Details about the launch request and process.</param>
+        protected override async void OnLaunched(Microsoft.UI.Xaml.LaunchActivatedEventArgs args)
+        {
+            m_window = new MainWindow();
+            var rootFrame = new Frame();
+            await RegisterComponentsAsync(rootFrame);
+            rootFrame.NavigationFailed += RootFrame_NavigationFailed;
+            rootFrame.Navigate(typeof(MainPage), args);
+            m_window.Content = rootFrame;
+            m_window.Activate();
+        }
+
+        private void RootFrame_NavigationFailed(object sender, NavigationFailedEventArgs e)
+        {
+            throw new Exception($"Error loading page {e.SourcePageType.FullName}");
+        }
+
+        private Window m_window;
+
+        internal Window Window => m_window;
+
+        private async Task RegisterComponentsAsync(Frame rootFrame)
+        {
+            var navigationService = new NavigationService(rootFrame);
+            navigationService.Configure(nameof(MainPage), typeof(MainPage));
+            navigationService.Configure(nameof(ItemDetailsPage), typeof(ItemDetailsPage));
+            var dataService = new SqliteDataService();
+            await dataService.InitializeDataAsync();
+
+            HostContainer = Host.CreateDefaultBuilder()
+                .ConfigureServices(services =>
+                {
+                    services.AddSingleton<INavigationService>(navigationService);
+                    services.AddSingleton<IDataService>(dataService);
+                    services.AddTransient<MainViewModel>();
+                    services.AddTransient<ItemDetailsViewModel>();
+                }).Build();
+        }
+    }
+}