add retirement note

Author: duongau

articles/cdn/cdn-create-new-endpoint.md

@@ -10,6 +10,8 @@ ms.date: 03/20/2024
 ms.author: duau
 ---
 
+[!INCLUDE [Azure CDN from Microsoft (classic) retirement notice](../../includes/cdn-classic-retirement.md)]
+
 # Quickstart: Create an Azure Content Delivery Network profile and endpoint
 
 In this quickstart, you enable Azure Content Delivery Network by creating a new content delivery network profile, which is a collection of one or more content delivery network endpoints. After you've created a profile and an endpoint, you can start delivering content to your customers.