Update TOC.yml

Author: swinarko

articles/data-factory/TOC.yml

@@ -25,6 +25,8 @@
     href: quickstart-create-data-factory-rest-api.md
   - name: Create data factory - Resource Manager template
     href: quickstart-create-data-factory-resource-manager-template.md
+  - name: Security - Enable Customer Managed Key Encryption
+    href: quickstart-enable-customer-managed-key.md
   - name: Create data flow
     href: data-flow-create.md
 - name: Tutorials