Add badges.

Author: aptx4869

README.md

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 # CommentCoreLibrary 弹幕核心通用构件
+[![NPM version](https://badge.fury.io/js/comment-core-library.svg)](http://badge.fury.io/js/comment-core-library)
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+[![Dependency Status](https://gemnasium.com/aptx4869/CommentCoreLibrary.svg)](https://gemnasium.com/aptx4869/CommentCoreLibrary)
+[![Built with Grunt](https://cdn.gruntjs.com/builtwith.png)](http://gruntjs.com/)
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 The CommentCoreLibrary is a set of Javascript modules that make up the
 core controller for comments streaming on top of timed media (video or audio).
 It is intended as a catalyst for the development of timed "danmaku" comments