Add Syndie

https://github.com/Kickball/awesome-selfhosted/issues/146

README.md

@@ -232,6 +232,7 @@ Some [Groupware](#groupware) solutions also feature calendar/address book editin
   * [Rocket.Chat](http://rocket.chat/) – Teamchat solution similar to Gitter.im or Slack - `MIT`
   * [Synapse](https://matrix.org/blog/project/synapse/) - A server for [Matrix](https://matrix.org/), an open standard for decentralized persistent communication ([Source code](https://github.com/matrix-org/synapse)) `Apache` `Python`
     * [Matrix Console Web](https://matrix.org/blog/project/matrix-console-web/) - A web client meant to be a showcase of Matrix capabilities, and reference implementation of the Matrix standard ([Source code](https://github.com/matrix-org/matrix-angular-sdk)) `Apache` `Javascript`
+  * [Syndie](https://www.syndie.de) - Syndie is a libre system for operating distributed forums. `Public Domain` `Java`
   * [Tox](https://tox.chat/) -  A distributed, secure messenger with audio and video chat capabilities. `GPLv3` `C`
 
 ### Social Networks and Forums
@@ -843,5 +844,3 @@ The list of contributors can be found below
     1  steven jacobs <stjacobs@fastmail.fm>
     1  stevesbrain <stevesbrain@users.noreply.github.com>
     1  ttoups <ich@timotoups.de>
-
-