Add starter code for chapter 8

No modifications for Complete folder yet.

Chapter08/Complete/MyMediaCollection/Views/MainPage.xaml.cs

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+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.UI.Xaml;
+using Microsoft.UI.Xaml.Controls;
+using MyMediaCollection.ViewModels;
+
+namespace MyMediaCollection.Views
+{
+    /// <summary>
+    /// An empty page that can be used on its own or navigated to within a Frame.
+    /// </summary>
+    public sealed partial class MainPage : Page
+    {
+        public MainPage()
+        {
+            ViewModel = App.HostContainer.Services.GetService<MainViewModel>();
+            this.InitializeComponent();
+            Loaded += MainPage_Loaded;
+        }
+
+        private void MainPage_Loaded(object sender, RoutedEventArgs e)
+        {
+            var mainWindow = (Application.Current as App)?.Window as MainWindow;
+            if (mainWindow != null)
+            {
+                mainWindow.SetPageTitle("Home");
+            }
+        }
+
+        public MainViewModel ViewModel;
+    }
+}