add more next steps

Author: zhiyuanliang-ms

articles/azure-app-configuration/manage-feature-flags.md

@@ -160,6 +160,9 @@ To start using feature flags with Azure App Configuration, continue to the follo
 > [!div class="nextstepaction"]
 > [Python](./quickstart-feature-flag-python.md)
 
+> [!div class="nextstepaction"]
+> [JavaScript](./quickstart-feature-flag-javascript.md)
+
 > [!div class="nextstepaction"]
 > [Azure Kubernetes Service](./quickstart-feature-flag-azure-kubernetes-service.md)