docs: HowTo IRouteNotifier

doc/Learn/Navigation/Advanced/HowTo-IRouteNotifier.md

@@ -0,0 +1,35 @@
+---
+uid: Uno.Extensions.Navigation.Advanced.IRouteNotifier
+---
+# How-To: Use IRouteNotifier to Handle Route Changes
+
+The `IRouteNotifier` interface allows you to track and respond to route changes through the `RouteChanged` event. This guide will show you how to use `IRouteNotifier` to handle route changes and improve your app's navigation.
+
+## Step-by-steps
+
+> [!IMPORTANT]
+> This guide assumes you used the template wizard or `dotnet new unoapp` to create your solution. If not, it is recommended that you follow the [Creating an application with Uno.Extensions article](xref:Uno.Extensions.HowToGettingStarted) for creating an application from the template.
+
+### How to Use `IRouteNotifier` to Monitor Route Changes
+
+The `IRouteNotifier` provides an effective way to monitor and respond to route changes within your application. To begin using `IRouteNotifier`, ensure your class has access to an instance of an `IRouteNotifier` implementation. Add a parameter of type `IRouteNotifier` to the constructor of your class where you want to monitor route changes.
+
+```csharp
+public class MyClass
+{
+    private readonly IRouteNotifier _notifier;
+
+    public MyClass(IRouteNotifier notifier)
+    {
+        _notifier = notifier;
+        _notifier.RouteChanged += RouteChanged;
+    }
+
+    private async void RouteChanged(object? sender, RouteChangedEventArgs e)
+    {
+        // Implement your logic to handle route change here
+    }
+}
+```
+
+<!-- TODO: Add IRouteNotifier, NavigationResponse, INavigator usage example -->