Added code climate badge

# What

Add code climate to the repo

[![Code Climate](https://codeclimate.com/repos/5461c4f6e30ba075bc0a0ab0/badges/11031f420440e8a9f525/gpa.svg)](https://codeclimate.com/repos/5461c4f6e30ba075bc0a0ab0/feed) [![Test Coverage](https://codeclimate.com/repos/5461c4f6e30ba075bc0a0ab0/badges/11031f420440e8a9f525/coverage.svg)](https://codeclimate.com/repos/5461c4f6e30ba075bc0a0ab0/feed) [![Inline docs](http://inch-ci.org/github/teambox/redbooth-ruby.svg?branch=master)](http://inch-ci.org/github/teambox/redbooth-ruby)