Added nodei.co badge to readme

Author: kombucha

README.md

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 Push Server is a cross-plateform push server based on [node-apn](https://github.com/argon/node-apn) and [node-gcm](https://github.com/ToothlessGear/node-gcm). Push Server currently supports iOS (APN) and android (GCM) platforms. It uses mongoDB to store the push tokens. 
 Note that this server is not meant to be used as a front facing server as there's no particular security implemented.
 
+[![NPM](https://nodei.co/npm/node-pushserver.png?downloads=true&stars=true)](https://nodei.co/npm/node-pushserver/)
 
 ## Getting started