Update index.yml

Adding release notes

Author: msftadam

articles/operator-service-manager/index.yml

@@ -24,6 +24,8 @@ landingContent:
         links:
           - text: What is Azure Operator Service Manager?
             url: azure-operator-service-manager-overview.md
+          - text: Azure Operator Service Manager Release Notes
+            url: release-notes.md
       - linkListType: concept
         links:
           - text: Helm requirements
@@ -89,4 +91,4 @@ landingContent:
       - linkListType: reference
         links:
           - text: Glossary
-            url: glossary.md
+            url: glossary.md