Add scrutinizer score on README.md

README.md

-[![Build Status](https://travis-ci.org/tracim/tracim.svg?branch=master)](https://travis-ci.org/tracim/tracim)
-[![Coverage Status](https://img.shields.io/coveralls/tracim/tracim.svg)](https://coveralls.io/r/tracim/tracim)
+[![Build Status](https://travis-ci.org/tracim/tracim.svg?branch=master)](https://travis-ci.org/tracim/tracim) [![Coverage Status](https://img.shields.io/coveralls/tracim/tracim.svg)](https://coveralls.io/r/tracim/tracim) [![Scrutinizer Code Quality](https://scrutinizer-ci.com/g/tracim/tracim/badges/quality-score.png?b=master)](https://scrutinizer-ci.com/g/tracim/tracim/?branch=master)
 
 # Tracim - Introduction #