chore: Adding remarks to ResponsiveView doc

doc/controls/ResponsiveView.md

@@ -7,6 +7,29 @@ uid: Toolkit.Controls.ResponsiveView
 
 The `ResponsiveView` provides the ability to display different content based on screen size, making it easy to adapt to various devices.
 
+## Remarks
+
+The ResponsiveView Control adapts to different screen sizes by dynamically choosing the right template. It looks at the current screen width and the defined templates. Since not all templates need a value, the control ensures a smooth user experience by picking the smallest defined template that satisfies the width requirements. If no match is found, it defaults to the largest defined template.
+
+**Initialization**: The `ResponsiveHelper` needs to be hooked up to the window's `SizeChanged` event in order for it to receive updates when the window size changes.
+This is typically done in the `OnLaunched` method in the `App` class, where you can get the current window and call the `HookupEvent` method on the `ResponsiveHelper`.
+
+Here is an example of how this might be achieved:
+
+```cs
+protected override void OnLaunched(LaunchActivatedEventArgs args)
+{
+#if NET6_0_OR_GREATER && WINDOWS && !HAS_UNO
+	MainWindow = new Window();
+#else
+	MainWindow = Microsoft.UI.Xaml.Window.Current;
+#endif
+	// ...
+	var helper = Uno.Toolkit.UI.ResponsiveHelper.GetForCurrentView();
+	helper.HookupEvent(MainWindow);
+}
+```
+
 ## Inheritance 
 Object → DependencyObject → UIElement → FrameworkElement → Control → ContentControl