Update _index.md

Author: pareenaverma

content/learning-paths/laptops-and-desktops/win_xamarin_forms/_index.md

@@ -6,6 +6,7 @@ minutes_to_complete: 30
 who_is_this_for: This learning path is for developers who want to learn how to create cross-platform applications, and leverage performance improvements on Arm64.
 
 learning_objectives:
+    - Learn how to use Model View ViewModel (MVVM) architectural pattern
     - Create and build Xamarin Forms application
     - Measure code execution performance uplift on Arm64