Update docs_menu.yml

Author: PowershellScripts

_data/docs_menu.yml

@@ -49,6 +49,8 @@
       link: /articles/en/Viva/How to post as delegate/
     - name: How to close a conversation
       link: /articles/en/Viva/Closeconversation/
+    - name: Manage Viva Engage with Graph API
+      link: /articles/en/Viva/vivagraphapi/