[Feature request] Add nextcloud support

[njmdietrich]

Hi,
your tool looks very promising. Do you think there is a chance you could add nextcloud support in the future?

[takiyon]

As someone who hosts their own cloud services, I definately would love NextCloud support as well.

[emu-sync]

Hey! I haven't had as much free time as I'd like recently to work on EmuSync, but I'll definitely consider looking into this at some point.