add badge

README.md

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 # Three Dots
 
+[![npm](https://img.shields.io/npm/v/three-dots.svg)](https://www.npmjs.com/package/three-dots)
+[![license](https://img.shields.io/github/license/mashape/apistatus.svg)](https://github.com/nzbin/three-dots)
+
 The project is a set of CSS loading animations created with three dots which made by just single element. I think the project can not only enhance your CSS skills but also improve your imagination.
 
 > The LESS files are contributed by other people, it's not the newest.