Update readme, add screenshots

Author: ole

README.md

@@ -19,14 +19,22 @@ By [Ole Begemann](https://oleb.net), 2022
 
 Requires iOS 16 or macOS 13.
 
+## Screenshots
+
+<img src="assets/ios-root-screen.png" width="197" height="426"/> <img src="assets/ios-list-dynamic.png" width="197" height="426"/> <img src="assets/ios-tabview.png" width="197" height="426"/>
+
+<img src="assets/mac-scrollview-dynamic.png" width="465" height="301"/>
+
 ## The `LifecycleMonitor` view
 
-All examples use one or more `LifecycleMonitor` views as their content. This view tracks its lifecycle events and displays them as constantly-updating timestamps. For example, this view got created 2:17 minutes ago, which is also when its `@State` got created. Its `.onAppear` and `.onDisappear` actions were last called 13 and 18 seconds ago, respectively:
+All examples use one or more [`LifecycleMonitor`](https://github.com/ole/swiftui-view-lifecycle/blob/main/ViewLifecycle/LifecycleMonitor.swift) views as their content. This view tracks its lifecycle events and displays them as constantly-updating timestamps. For example, this view got created 2:17 minutes ago, which is also when its `@State` got created. Its `.onAppear` and `.onDisappear` actions were last called 13 and 18 seconds ago, respectively:
 
 <img src="assets/LifecycleMonitor-example.png" width="308" height="133"/>
 
 As you interact with the app, e.g. by scrolling through a `List`, you’ll see these timestamps update (or not, depending on the container view). Pay special attention to resets of the `@State` field because this means that the view got destroyed and recreated, losing all of its internal state.
 
+The view’s background color is set to a random color when its `@State` is created, so color changes are another indication that the view identity has changed.
+
 ## License
 
 [MIT license](LICENSE.md)