update resources

Author: Doug Mahugh

README.md

@@ -89,13 +89,23 @@ This project has adopted the [Microsoft Open Source Code of Conduct](https://ope
 
 ## Resources
 
+Documentation:
 * [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)
+
+Samples:
+* [Python authentication samples for Microsoft Graph](https://github.com/microsoftgraph/python-sample-auth)
+* [Working with paginated Microsoft Graph responses in Python](https://github.com/microsoftgraph/python-sample-pagination)
+* [Sending mail via Microsoft Graph from Python](https://github.com/microsoftgraph/python-sample-send-mail)
+
+Auth libraries:
 * [Microsoft ADAL for Python](https://github.com/AzureAD/azure-activedirectory-library-for-python)
 * [Flask-Oauthlib](https://flask-oauthlib.readthedocs.io/en/latest/)
 * [Requests-Oauthlib](https://media.readthedocs.org/pdf/requests-oauthlib/latest/requests-oauthlib.pdf)
 * [Azure Active Directory v2.0 authentication libraries](https://docs.microsoft.com/en-us/azure/active-directory/develop/active-directory-v2-libraries)
+
+Specifications:
 * [Oauth 2.0 specification](http://www.rfc-editor.org/rfc/rfc6749.txt)
 * [Open ID Connect specifications](http://openid.net/connect/)