Add Seafile (File Sharing and Synchronization) Demo

README.md

@@ -280,7 +280,7 @@ CMS are a practical way to setup a website with many features. CMS often come wi
   * [ownCloud](https://owncloud.org/) - All-in-one solution for saving and sharing files, photos, music- `AGPLv3` `PHP`
   * [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. - `GPLv2`
+  * [Seafile](http://www.seafile.com/en/home/) - File hosting and sharing solution primary for teams and organizations. ([Demo](https://seacloud.cc/demo)) `GPLv2`
   * [SparkleShare](http://sparkleshare.org/) - Self hosted, instant, secure file sync
   * [Syncany](https://www.syncany.org/) - Secure file sync software for arbitrary storage backends - An open-source cloud storage and filesharing application. Securely synchronize your files to any kind of storage! `GPLv3` `Java`
   * [Syncthing](http://syncthing.net/) - Syncthing is an open source peer-to-peer file synchronisation tool ([Source code](https://github.com/syncthing/syncthing)) - `MPLv2` `Go`