Set up efi

Rastislav Koberrequested to merge
github/fork/fkondej/setup-efi into master

Created by: fkondej

I have tried to tackle #44 by applying some commands from the official Root on ZFS docs.

The below worked on my machine, but I know it is not correct, so please don't use it as is.

I am a beginner in this topic, so I don't know how to get it to a usable level. Feel free to do whatever you think is best: improve or close it.

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