Documentation | readme: Add build environment setup instructions for nixos (!218)

[Joel Sherrill (@joel)]

Joel Sherrill commented on a discussion on README.md: https://gitlab.rtems.org/rtems/docs/rtems-docs/-/merge_requests/218#note_146417

 >  podman rmi rtems-docs-server_img
 >  ```
 >  
 > +### NixOS
 > +
 > +Create a `shell.nix` file with the folllowing content:
 > +```nix
 > +{ }:
 > +let
 > +  pkgs =
 > +    import
 > +      (fetchTarball "https://github.com/NixOS/nixpkgs/archive/aa290c9891fa4ebe88f8889e59633d20cc06a5f2.tar.gz")

Please add a bit of text explaining the need for the magic looking command. A user reading this will have the same question.

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/docs/rtems-docs/-/merge_requests/218#note_146417
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