Update README.md with coveralls badge

Author: brunolm

README.md

@@ -1,7 +1,13 @@
 # Angular: How To
 [![Build Status](https://travis-ci.org/brunolm/angular-how-to.svg?branch=master)](https://travis-ci.org/brunolm/angular-how-to)
+[![Coverage Status](https://coveralls.io/repos/github/brunolm/angular-how-to/badge.svg?branch=master)](https://coveralls.io/github/brunolm/angular-how-to?branch=master)
 
 Each Pull Request will contain explanation and steps taken to complete a feature.
 
+## New project
+
 - [Create a new Angular project](https://github.com/brunolm/angular-how-to/pull/1)
+
+## Testing
+
 - [Add project on Travis CI](https://github.com/brunolm/angular-how-to/pull/2)