Update README.md

README.md

@@ -8,6 +8,7 @@
 [![Build Status](https://travis-ci.org/opensheetmusicdisplay/opensheetmusicdisplay.svg?branch=master)](https://travis-ci.org/opensheetmusicdisplay/opensheetmusicdisplay)
 [![Dependency Status](https://david-dm.org/opensheetmusicdisplay/opensheetmusicdisplay.png)](https://david-dm.org/opensheetmusicdisplay/opensheetmusicdisplay)
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+[![Code Climate](https://codeclimate.com/github/opensheetmusicdisplay/opensheetmusicdisplay/badges/gpa.svg)](https://codeclimate.com/github/opensheetmusicdisplay/opensheetmusicdisplay)
 
 Display sheet music ([MusicXML](http://www.musicxml.com) files) in the browser.
 Using the [VexFlow](https://github.com/0xfe/vexflow) music notation rendering API.