Added how to doc showing nix-shell and editing config

[JasonGoemaat]

#441

[SuperSandro2000]

Not sure if this is what should have been placed here. Those are all normal NixOS things and we can just link to some upstream doc about this.

[SuperSandro2000]

We shouldn't encourage people to run commands inside /mnt/ as it very slow. Please use a normal path like ~ in the examples.

[SuperSandro2000]

Suggested change

	[nix-shell:/mnt/c/t/nix]$ exit
	exit
	[nixos@nixos:/mnt/c/t/nix]$

[SuperSandro2000]

Suggested change

	To add packages, edit `/etc/nixos/configuration.nix` using sudo. You
	can use the `nano` editor which comes installed and uses CTRL+S to save
	and CTRL+X to exit:
	To add packages, edit `/etc/nixos/configuration.nix` using sudo.
	You can use the `nano` editor which comes installed and uses CTRL+S to save and CTRL+X to exit:

We don't need to write blocksatz.

[SuperSandro2000]

Suggested change

	```
	environment.systemPackages = [ pkgs.cowsay pkgs.lolcat ];
	}

...

environment.systemPackages = [ pkgs.cowsay pkgs.lolcat ];
}

[nzbr]

Not sure if this is what should have been placed here. Those are all normal NixOS things and we can just link to some upstream doc about this.

Agreed, I think we should keep our docs to WSL specific things and point to some general NixOS guide

[aikooo7]

My 2 cents here but I also agree with the others. If we allowed this then we would need to keep it update with another documentation, why not just let the user open it by himself? Since they are using wsl2 it is assumed they can open the documentation with internet or pre-download it before.