add dyu/comments (#1047)

README.md

@@ -357,6 +357,7 @@ _[IPBX](https://en.wikipedia.org/wiki/IP_PBX) telephony software_
   * [cartulary](https://github.com/daveajones/cartulary) - RSS reader, readability tool, article archiver, microblogger, social graph manager and reading list manager. `CDDL` `PHP`
   * [diaspora*](https://diasporafoundation.org/) - Distributed social networking server. ([Demo](https://podupti.me/go.php), [Source Code](https://github.com/diaspora/diaspora)) `AGPLv3` `Ruby`
   * [Discourse](http://www.discourse.org/) - Advanced forum / community solution based on Ruby and JS. ([Source Code](https://github.com/discourse/discourse)) `GPLv2` `Ruby`
+  * [dyu/comments](https://github.com/dyu/comments/) - A markdown-enabled comment engine powered by leveldb. ([Demo](https://dyu.github.io/comments/)) `Apache` `Java`
   * [Elgg](https://elgg.org/) - A powerful open source social networking engine. ([Source Code](https://github.com/Elgg/Elgg)) `GPLv2` `PHP`
   * [Flarum](http://flarum.org) - Delightfully simple forums. Flarum is the next-generation forum software that makes online discussion fun again. ([Source Code](https://github.com/flarum/flarum)) `MIT` `PHP`
   * [flaskbb](https://flaskbb.org/) - FlaskBB is forum software written in Python using the microframework Flask. You can easily create new topics, posts and send other users private messages. It also includes basic administration and moderation tools. ([Source Code](https://github.com/sh4nks/flaskbb)) `BSD` `Python`