Add chapter 10 sample project

Chapter10/TemplateStudioSampleApp/MainWindow.xaml.cs

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+using TemplateStudioSampleApp.Helpers;
+
+using Windows.UI.ViewManagement;
+
+namespace TemplateStudioSampleApp;
+
+public sealed partial class MainWindow : WindowEx
+{
+    private Microsoft.UI.Dispatching.DispatcherQueue dispatcherQueue;
+
+    private UISettings settings;
+
+    public MainWindow()
+    {
+        InitializeComponent();
+
+        AppWindow.SetIcon(Path.Combine(AppContext.BaseDirectory, "Assets/WindowIcon.ico"));
+        Content = null;
+        Title = "AppDisplayName".GetLocalized();
+
+        // Theme change code picked from https://github.com/microsoft/WinUI-Gallery/pull/1239
+        dispatcherQueue = Microsoft.UI.Dispatching.DispatcherQueue.GetForCurrentThread();
+        settings = new UISettings();
+        settings.ColorValuesChanged += Settings_ColorValuesChanged; // cannot use FrameworkElement.ActualThemeChanged event
+    }
+
+    // this handles updating the caption button colors correctly when indows system theme is changed
+    // while the app is open
+    private void Settings_ColorValuesChanged(UISettings sender, object args)
+    {
+        // This calls comes off-thread, hence we will need to dispatch it to current app's thread
+        dispatcherQueue.TryEnqueue(() =>
+        {
+            TitleBarHelper.ApplySystemThemeToCaptionButtons();
+        });
+    }
+}