Add chapter 10 sample project

Chapter10/TemplateStudioSampleApp/Views/MainPage.xaml.cs

@@ -0,0 +1,19 @@
+using Microsoft.UI.Xaml.Controls;
+
+using TemplateStudioSampleApp.ViewModels;
+
+namespace TemplateStudioSampleApp.Views;
+
+public sealed partial class MainPage : Page
+{
+    public MainViewModel ViewModel
+    {
+        get;
+    }
+
+    public MainPage()
+    {
+        ViewModel = App.GetService<MainViewModel>();
+        InitializeComponent();
+    }
+}