#9 Included coverage report and licence to readme

Author: navarasu

README.md

@@ -1,6 +1,6 @@
 <h1><img height="75" src="https://user-images.githubusercontent.com/20145075/86084483-aa2d4b80-baba-11ea-938d-53d6b7e37896.png" alt="iOS resume application project app icon"></h1>
 
-[![serverless](http://public.serverless.com/badges/v3.svg)](http://www.serverless.com)  [![npm](https://img.shields.io/npm/v/serverless-ruby-layer.svg)](https://www.npmjs.com/package/serverless-ruby-layer) [![Build Status](https://img.shields.io/circleci/build/github/navarasu/serverless-ruby-layer)](https://circleci.com/gh/navarasu/serverless-ruby-layer)
+[![serverless](http://public.serverless.com/badges/v3.svg)](http://www.serverless.com)  [![npm](https://img.shields.io/npm/v/serverless-ruby-layer.svg)](https://www.npmjs.com/package/serverless-ruby-layer) [![Build Status](https://img.shields.io/circleci/build/github/navarasu/serverless-ruby-layer)](https://circleci.com/gh/navarasu/serverless-ruby-layer) [![Coverage Status](https://coveralls.io/repos/github/navarasu/serverless-ruby-layer/badge.svg?branch=master)](https://coveralls.io/github/navarasu/serverless-ruby-layer?branch=master) [![MIT License](https://img.shields.io/npm/l/serverless-ruby-layer)](https://github.com/navarasu/serverless-ruby-layer/blob/master/LICENSE)
 
 A Serverless Plugin to bundle ruby gems from Gemfile and deploy it to lambda layer automatically while running `severless deploy`.