Build with Nix

[MaybeJustJames]

As mentioned in #64, Nix makes setting up a build/dev environment much easier.

[MaybeJustJames]

purescript-0.13.8 is marked as broken in nixos-20.09 :(

[malikwirin]

This has been packaged for nix but the package has been marked as broken because the following dependencies are not available in nixpkgs:

       > aeson >=2.0.3.0 && <2.1,
       > ansi-terminal >=0.11 && <0.12,
       > ansi-wl-pprint >=0.6.9 && <0.7,
       > base >=4.16.2 && <4.17,
       > hspec-core <2.9.3,
       > mtl >=2.2.2 && <2.3,
       > optparse-applicative ==0.17.0.0,
       > process ==1.6.13.1,
       > text >=1.2.5.0 && <1.3,
       > transformers >=0.5.6.2 && <0.6,
       > unordered-containers ==0.2.19.1

You need help in bumping these dependencies or writing a flake.nix for the project?

[MaybeJustJames]

You need help in bumping these dependencies or writing a flake.nix for the project?

Yes please. That would be great