Create Stargazers docs

Author: sergeyklay

doc/repo/stargazers.md

@@ -0,0 +1,10 @@
+## Repo / Stargazers API
+[Back to the "Repos API"](../repos.md) | [Back to the navigation](../README.md)
+
+### List all stargazers
+
+```php
+$stargazers = $client->api('repo')->stargazers();
+
+$stargazers->all('twbs', 'bootstrap');
+```