Rename salesbook

salesbook.Shared/Core/Messages/Back/BackNavigationService.cs

@@ -0,0 +1,16 @@
+using CommunityToolkit.Mvvm.Messaging;
+
+namespace salesbook.Shared.Core.Messages.Back;
+
+public class BackNavigationService
+{
+    public event Action? OnHardwareBack;
+
+    public BackNavigationService(IMessenger messenger)
+    {
+        messenger.Register<HardwareBackMessage>(this, (_, _) =>
+        {
+            OnHardwareBack?.Invoke();
+        });
+    }
+}