Add example configuration

[jirsat]

Two new example files.
Nginx configuration and systemd service file.
Especially nginx configuration is tricky due to socket.io so including it in repository should help point people to the right direction.
This should be an addition to documentation, not a replacement.

[Kruptein]

Hey, I don't know whether you noticed, but I declined your earlier PR, because you should make documentation changes on my other repository: https://github.com/Kruptein/planarally-docs.

As that's the location that populates the https://planarally.io website.

[jirsat]

I've noticed, but this is something I think should be included here. I'm working on documentation too but this will help a lot i think. But if you think this should be done other way, please tell, I'll keep it in mind.

[Kruptein]

Can you add a changelog file ?

[jirsat]

Do you still need this or should i close it? Sorry for inactivity