Add starter project for Chapter 13

Chapter13/Start/UnoMediaCollection/UnoMediaCollection.Base/AppHead.xaml.cs

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+using Microsoft.UI.Xaml;
+using Uno.Resizetizer;
+
+namespace UnoMediaCollection
+{
+    public sealed partial class AppHead : App
+    {
+        /// <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 AppHead()
+        {
+            this.InitializeComponent();
+        }
+
+        /// <summary>
+        /// Invoked when the application is launched normally by the end user.  Other entry points
+        /// will be used such as when the application is launched to open a specific file.
+        /// </summary>
+        /// <param name="args">Details about the launch request and process.</param>
+        protected override void OnLaunched(LaunchActivatedEventArgs args)
+        {
+            base.OnLaunched(args);
+
+            MainWindow.SetWindowIcon();
+        }
+    }
+}