Add lint & browser coverage steps to README (#185)

* Add lint & browser coverage info to Readme

* Incorporate review comment in PR#185

Author: jaishirole

README.md

@@ -126,7 +126,8 @@ To build/test the project locally on your computer:
 4. __Run the tests__<br>
 `npm test`
 
-
+5. __Check the code coverage__<br>
+`npm run coverage`
 
 License
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