Add reference to MAPS agreement to MAPS peering walkthrough

Author: JonathanSaracoMS

articles/internet-peering/walkthrough-peering-service-all.md

@@ -39,6 +39,8 @@ To establish direct interconnect for Peering Service, follow these requirements:
 
 ## Establish Direct Interconnect for Peering Service
 
+Refer to the [Azure Peering Service partner overview requirements](./maps-partner-overview.md#maps-partner-requirements) and ensure that you have signed a Microsoft Azure Peering Service agreement before proceeding.
+
 To establish a Peering Service interconnect with Microsoft, follow the following steps:
 
 ### 1. Associate your public ASN with your Azure subscription