add code badges to readme

README.md

 ### gitlab-shell: ssh access and repository management
-[![CI](http://ci.gitlab.org/projects/4/status?ref=master)](http://ci.gitlab.org/projects/4?ref=master)
+#### Code status
+
+* [![CI](http://ci.gitlab.org/projects/4/status?ref=master)](http://ci.gitlab.org/projects/4?ref=master)
+
+* [![Code Climate](https://codeclimate.com/github/gitlabhq/gitlab-shell.png)](https://codeclimate.com/github/gitlabhq/gitlab-shell)
+
+* [![Coverage Status](https://coveralls.io/repos/gitlabhq/gitlab-shell/badge.png?branch=master)](https://coveralls.io/r/gitlabhq/gitlab-shell)
+
 ### Setup