Create small command line program that parses arguments

Before starting my take-home assignment, the instructions advised me to create a
"Hello, world" program in the language of my choice. Since I'm choosing Haskell,
I created this example as my starter boilerplate.

scratch/brilliant/shell.nix

@@ -0,0 +1,9 @@
+let
+  pkgs = import /home/wpcarro/nixpkgs {};
+in pkgs.mkShell {
+  buildInputs = with pkgs; [
+    (haskellPackages.ghcWithPackages (hpkgs: with hpkgs; [
+      optparse-applicative
+    ]))
+  ];
+}