Adding zk to nixpkgs

[pinpox]

Just wanted to let you know, I'm adding zk to nixpkgs so it can be installed directly on NixOS, since there seems to be interest by others in using is on that OS.

There is a PR already open for it and awaiting review. I'll be keeping the package up to date there, should I miss a release just ping me and I'll bump the version.

[mickael-menu]

Cool, thanks!

[keinsell]

I've installed zk in my home-manager configuration, so it seems package was actually published some time ago and discussion can be closed.