add link to Graph/REST topic

Author: Doug Mahugh

README.md

@@ -131,6 +131,7 @@ This project has adopted the [Microsoft Open Source Code of Conduct](https://ope
 ## Resources
 
 * [Microsoft Graph Dev Center](https://developer.microsoft.com/en-us/graph/)
+* [Get started with Microsoft Graph and REST](https://developer.microsoft.com/en-us/graph/docs/concepts/rest)
 * [Get access tokens to call Microsoft Graph](https://developer.microsoft.com/en-us/graph/docs/concepts/sample_overview)
 * [Authorize access to web applications using OAuth 2.0 and Azure Active Directory](https://docs.microsoft.com/en-us/azure/active-directory/develop/active-directory-protocols-oauth-code)
 * [Microsoft ADAL for Python](https://github.com/AzureAD/azure-activedirectory-library-for-python)