Merge pull request #345 from codacy-badger/codacy-badge

Add a Codacy badge to README.md

Author: lgarithm

README.md

@@ -13,6 +13,7 @@
 </div>
 </a>
 
+[![Codacy Badge](https://api.codacy.com/project/badge/Grade/ca2a29ddcf7445588beff50bee5406d9)](https://app.codacy.com/app/tensorlayer/tensorlayer?utm_source=github.com&utm_medium=referral&utm_content=tensorlayer/tensorlayer&utm_campaign=badger)
 [![Gitter](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/tensorlayer/Lobby#?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge)
 [![Build Status](https://travis-ci.org/tensorlayer/tensorlayer.svg?branch=master)](https://travis-ci.org/tensorlayer/tensorlayer)
 [![Documentation Status](https://readthedocs.org/projects/tensorlayer/badge/?version=latest)](http://tensorlayer.readthedocs.io/en/latest/?badge=latest)