Add Essentials Sample

Author: jfversluis

src/Essentials/samples/Samples/ViewModel/PermissionsViewModel.cs

@@ -26,6 +26,7 @@ public class PermissionsViewModel : BaseViewModel
 				new PermissionItem("Phone", new Permissions.Phone()),
 				new PermissionItem("Photos", new Permissions.Photos()),
 				new PermissionItem("Photos AddOnly", new Permissions.PhotosAddOnly()),
+				new PermissionItem("Post Notification", new Permissions.PostNotifications()),
 				new PermissionItem("Reminders", new Permissions.Reminders()),
 				new PermissionItem("Sensors", new Permissions.Sensors()),
 				new PermissionItem("SMS", new Permissions.Sms()),