Add GHE simple sample

README.md

@@ -7,10 +7,11 @@
 [![Join the chat at https://gitter.im/PyGithub/PyGithub](https://badges.gitter.im/PyGithub/PyGithub.svg)](https://gitter.im/PyGithub/PyGithub?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
 [![Open Source Helpers](https://www.codetriage.com/pygithub/pygithub/badges/users.svg)](https://www.codetriage.com/pygithub/pygithub)
 
-PyGitHub is a Python (2 and 3) library to access the [GitHub API v3].
+PyGitHub is a Python (2 and 3) library to access the [GitHub API v3] and [Github Enterprise API v3].
 This library enables you to manage [GitHub] resources such as repositories, user profiles, and organizations in your Python applications.
 
 [GitHub API v3]: https://developer.github.com/v3
+[Github Enterprise API v3]: https://developer.github.com/enterprise/2.13/v3/
 [GitHub]: https://github.com
 
 ## Install
@@ -32,6 +33,9 @@ g = Github("user", "password")
 # or using an access token
 g = Github("access_token")
 
+# Github Enterprise with custom hostname
+g = Github(base_url="https://{hostname}/api/v3", login_or_token="access_token")
+
 # Then play with your Github objects:
 for repo in g.get_user().get_repos():
     print(repo.name)