[Feature request] Add support for init

[werdahias]

It would be nice to have a init category. E.g.
Init: systemD/openRC/sysvinit
This could easily be determined by ps --no-headers -o comm 1. This returns either systemd or sysvinit. If it returns sysvinit, another distinction has to be made.
I believe even if not a lot of people are going to use that, it would be a nice addition for neofetch.