Added Piratebox to Groupware/File Sharing and Sync

Group-centric file sharing and sync hardware/software system — http://piratebox.cc/start

README.md

@@ -290,6 +290,7 @@ Some [Groupware](#groupware) solutions also feature file sharing synchronization
   * [Mediacrush](https://mediacru.sh/) - a website you can upload images, audio, and video to, and receive a link to share it with your friends ([Source code](https://github.com/MediaCrush/MediaCrush))
   * [Nimbus](https://github.com/ethanal/nimbus) - A drag-and-drop shortlink file sharer for OS X - `MIT` `Python`
   * [OnionShare](https://onionshare.org/) - securely and anonymously share a file of any size.
+  * [Piratebox](http://piratebox.cc/) - A DIY anonymous offline file-sharing and communications system built with free software and inexpensive off-the-shelf hardware. `GPLv3`
   * [Pomf](https://github.com/nokonoko/Pomf) -  Simple file uploading and sharing, source for the now shut down site Pomf.se `MIT` `PHP/Nodejs`
   * [Pydio](https://pyd.io/) - Turn any web server into a powerful file management system and an alternative to mainstream cloud storage providers.
   * [Seafile](http://www.seafile.com/en/home/) - File hosting and sharing solution primary for teams and organizations. ([Demo](https://seacloud.cc/demo)) `GPLv2`