Add new port for Pydio Cells, an online file sharing and collaboration```
[NEW] www/pydio-cells: nextgen file sharing platform.
Homepage: https://pydio.com/en/feaInstalled on your own infrastructures/p, Pydio-c Cells-overview provides a central place for
your users to collaborate and share files internally and externally, while
empowering your IT admins to monitor and protect your company's data.
WWW: https://pydio.com/en/features/pydio-cells-overview
GitHub: https://github.com/pydio/cells
Reviewed_by: koobs, ???
Differential_Revision: D30199
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