Add badges

Author: Kimon Kar

README.md

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 # xivapi-js
 
+[![npm version](https://badge.fury.io/js/xivapi-js.svg)](https://www.npmjs.com/package/xivapi-js)
+[![license](https://img.shields.io/github/license/xivapi/xivapi-js.svg)](LICENSE)
+
 This is a pure JS wrapper for interacting with [XIVAPI](https://xivapi.com/) and handling all requests in a simple, promise-driven manner.
 
 ## Installation