Add chapter 10 sample project

Chapter10/TemplateStudioSampleApp/Contracts/Services/IWebViewService.cs

@@ -0,0 +1,34 @@
+using Microsoft.UI.Xaml.Controls;
+using Microsoft.Web.WebView2.Core;
+
+namespace TemplateStudioSampleApp.Contracts.Services;
+
+public interface IWebViewService
+{
+    Uri? Source
+    {
+        get;
+    }
+
+    bool CanGoBack
+    {
+        get;
+    }
+
+    bool CanGoForward
+    {
+        get;
+    }
+
+    event EventHandler<CoreWebView2WebErrorStatus>? NavigationCompleted;
+
+    void Initialize(WebView2 webView);
+
+    void GoBack();
+
+    void GoForward();
+
+    void Reload();
+
+    void UnregisterEvents();
+}