Added repository documentation to current user (KnpLabs#671)

* created currentuser repositories documentation

* Added code example to current users repo docs

* changed email variable to repository variable

* added parameter default and GitHub API link

* added possible values

Author: josephmancuso

doc/currentuser/repositories.md

@@ -0,0 +1,30 @@
+## Current user / Repo API
+[Back to the navigation](../README.md)
+
+> Requires [authentication](../security.md).
+
+### List repositories that are accessible to the authenticated user.
+
+```php
+$repositories = $client->currentUser()->repositories();
+```
+
+This includes repositories owned by the authenticated user, repositories where the authenticated user is a collaborator, and repositories that the authenticated user has access to through an organization membership.
+
+There are three values that can be passed into the `repositories` method: `type`, `sort` and `direction`
+
+| Parameters    | Default     | Possible Values                              |
+| ------------- |-------------| -------------------------------------------- |
+| type          | `owner`     | `all`, `owner`, `public`, `private`, `member`
+| sort          | `full_name` | `created`, `updated`, `pushed`, `full_name`
+| direction     | `asc`       | `asc`, `desc`
+
+> See https://developer.github.com/v3/repos/#list-your-repositories for possible values and additional information 
+
+#### Code Example:
+
+```php
+$client = new \Github\Client(); 
+$client->authenticate($github_token, null, \Github\Client::AUTH_HTTP_TOKEN);
+$client->currentUser()->repositories();
+```