add code climate badge to readme

Author: michaelNgiri

README.md

@@ -1,4 +1,8 @@
 # Fetch-API-Client
-A front end client that makes request to a backend API using fetch 
+An ES6 front end API client that makes request to a backend API using fetch 
 
-homepage: http://devpool-client.herokuapp.com
+homepage: http://devpool-client.herokuapp.com
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+
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+[![Maintainability](https://api.codeclimate.com/v1/badges/c15ab3b0f6907b1526ce/maintainability)](https://codeclimate.com/github/michaelNgiri/Fetch-API-Client/maintainability)