Update README.md

Add Pydio, ownCloud alternative

README.md

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 * [git-annex assistant](http://git-annex.branchable.com/assistant/) - A synchronised folder on each of your OSX and Linux computers, Android devices, removable drives, NAS appliances, and cloud services.
 * [ownCloud](https://owncloud.org) - Provides universal access to your files via the web, your computer or your mobile devices.
+* [Pydio])(https://pyd.io) - Pydio (formerly AjaXplorer) is a mature open source software solution for file sharing and synchronization.
 * [Seafile](http://seafile.com) - Another Open Source Cloud Storage solution.
 * [SparkleShare](http://sparkleshare.org/) - Provides cloud storage and file synchronization services. By default, it uses Git as a storage backend.
 * [Swift](http://docs.openstack.org/developer/swift/) - A highly available, distributed, eventually consistent object/blob store.