added link to Blob Storage as Checkpoint Store article

Author: spelluru

articles/event-hubs/index.yml

@@ -127,6 +127,8 @@ landingContent:
             url: /azure-stack/operator/event-hubs-rp-prerequisites
           - text: Installation (operator)
             url: /azure-stack/operator/event-hubs-rp-install            
+          - text: Use Blob Storage as checkpoint store
+            url: use-blob-storage-checkpoint-store-azure-stack-hub.md
       - linkListType: quickstart
         links:
           - text: Create Event Hubs cluster