Adding Azure Active Directory as example

Author: brandwe

README.md

@@ -127,6 +127,7 @@ The following table lists commonly used strategies:
 |[Google](https://github.com/jaredhanson/passport-google)       | OpenID                   |[Jared Hanson](https://github.com/jaredhanson)  |
 |[Google](https://github.com/jaredhanson/passport-google-oauth) | OAuth / OAuth 2.0        |[Jared Hanson](https://github.com/jaredhanson)  |
 |[Twitter](https://github.com/jaredhanson/passport-twitter)     | OAuth                    |[Jared Hanson](https://github.com/jaredhanson)  |
+|[Azure Active Directory](https://github.com/AzureAD/passport-azure-ad)     | OAuth 2.0 / OpenID / SAML  |[Azure](https://github.com/azuread)  |
 
 ## Examples