add environment diagram

Author: duongau

articles/expressroute/expressroute-howto-circuit-portal-resource-manager.md

@@ -4,7 +4,7 @@ description: In this quickstart, you learn how to create, provision, verify, upd
 services: expressroute
 author: duongau
 ms.author: duau
-ms.date: 10/21/2020
+ms.date: 04/23/2021
 ms.topic: quickstart
 ms.service: expressroute
 ms.custom:
@@ -15,6 +15,8 @@ ms.custom:
 
 This quickstart shows you how to create an ExpressRoute circuit using the Azure portal and the Azure Resource Manager deployment model. You can also check the status, update, delete, or deprovision a circuit.
 
+:::image type="content" source="media/expressroute-howto-circuit-portal-resource-manager/environment-diagram.png" alt-text="Diagram of ExpressRoute circuit deployment environment using Azure portal." border="false":::
+
 ## Prerequisites
 
 * An Azure account with an active subscription. [Create an account for free](https://azure.microsoft.com/free/?WT.mc_id=A261C142F).