filesystem support

[tpimh]

right now nenuzhnix can support ext2/3/4 filesystems (thanks, @protonesso for adding #21)

it's fine with me to release 0.1 with just that, but anyone interested in adding vfat, btrfs, zfs or even lanyardfs?

what filesystems do you want so see supported in nenuzhnix?

[tpimh]

which one? found at least 3:

• https://en.wikipedia.org/wiki/NVFS
• https://github.com/justingbanks/nvfs
• https://people.redhat.com/~mpatocka/nvfs/