Update README.md

README.md

@@ -14,25 +14,38 @@ https://user-images.githubusercontent.com/2297442/132313187-32f18c4b-e894-46db-9
 ```
 
 ```C#
+Window Build() => Window().Content(Label().Content("Minimal Avalonia"));
+
 AppBuilder.Configure<Application>()
-          .UsePlatformDetect()
-          .UseFluentTheme()
-          .StartWithClassicDesktopLifetime(desktop => {
-              desktop.MainWindow = new Window {
-                  Content = new Label { Content = "Minimal Avalonia" }
-              };
-          }, args);
+  .UsePlatformDetect()
+  .UseFluentTheme()
+  .StartWithClassicDesktopLifetime(Build, args);
 ```
 
 ```C#
+var count = 0;
+
+Window Build()
+  => Window(out var window)
+    .Title("MinimalAvalonia").Width(400).Height(300)
+    .Content(
+      StackPanel()
+        .Children(
+          Button(out var button)
+            .Content("Welcome to Avalonia, please click me!"),
+          TextBox(out var tb1)
+            .Text("Minimal Avalonia"),
+          TextBox()
+            .Text(window.BindTitle()),
+          Label()
+            .Content(button.ObserveOnClick().Select(_ => ++count).Select(x => $"You clicked {x} times."))))
+    .Title(tb1.ObserveText().Select(x => x?.ToUpper()));
+
 AppBuilder.Configure<Application>()
-          .UsePlatformDetect()
-          .UseFluentTheme()
-          .StartWithClassicDesktopLifetime(desktop => {
-              var window = new Window { Title = "Minimal Avalonia" };
-              window.Content = new TextBox { [!!TextBlock.TextProperty] = window[!!Window.TitleProperty] };
-              desktop.MainWindow = window;
-          }, args);
+  .UsePlatformDetect()
+  .UseFluentTheme()
+  .WithApplicationName("MinimalAvalonia")
+  .StartWithClassicDesktopLifetime(Build, args);
 ```
 
 # Generate