Update README.md

Added NPM badge

Author: Dervisevic

README.md

@@ -4,6 +4,7 @@ Angular Schema Form
 [![Build Status](https://travis-ci.org/Textalk/angular-schema-form.svg?branch=master)](https://travis-ci.org/Textalk/angular-schema-form)
 [![Coverage Status](https://coveralls.io/repos/Textalk/angular-schema-form/badge.png?branch=master)](https://coveralls.io/r/Textalk/angular-schema-form?branch=development)
 [![Bower version](https://badge.fury.io/bo/angular-schema-form.svg)](http://badge.fury.io/bo/angular-schema-form)
+[![npm version](https://badge.fury.io/js/angular-schema-form.svg)](http://badge.fury.io/js/angular-schema-form)
 
 Generate forms from JSON schemas using AngularJS!