Adding videos

Author: yoelhor

articles/active-directory/develop/custom-extension-get-started.md

@@ -10,7 +10,7 @@ ms.service: active-directory
 ms.subservice: develop
 ms.topic: how-to
 ms.workload: identity
-ms.date: 03/06/2023
+ms.date: 03/13/2023
 ms.author: davidmu
 ms.custom: aaddev
 ms.reviewer: JasSuri
@@ -21,7 +21,9 @@ ms.reviewer: JasSuri
 
 This article describes how to configure and setup a custom claims provider with the [token issuance start event](custom-claims-provider-overview.md#token-issuance-start-event-listener) type. This event is triggered right before the token is issued, and allows you to call a REST API to add claims to the token. 
 
-This how-to guide demonstrates the token issuance start event with a REST API running in Azure Functions and a sample OpenID Connect application.
+This how-to guide demonstrates the token issuance start event with a REST API running in Azure Functions and a sample OpenID Connect application. Before you start, take a look at following video, which demonstrates how to configure Azure AD custom claims provider with Function App:
+
+> [!VIDEO https://www.youtube.com/embed/r-JEsMBJ7GE]
 
 ## Prerequisites