Update content with Service Endpoint video

Update content with Service Endpoint video

Author: ranand12

articles/virtual-network/index.yml

@@ -189,7 +189,13 @@ landingContent:
             url: /powershell/module/az.network
           - text: REST
             url: /rest/api/virtual-network      
-          
+  # Card
+  - title: Explore Azure Virtual Network Service Endpoint
+    linkLists:
+      - linkListType: video
+        links:
+          - text: Azure Virtual Network Service Endpoint
+            url: https://www.youtube.com/watch?v=gxsitRRgylI