Add ReasonML boilerplate

After some toil, I finally support basic ReasonML starter code.

I'm adding it to the nut-score directory because I would like to make a simple
webpage that render some nutritional facts about nuts with respect to the
ketogenic diet.

I'm not sure if I should include or exclude te .bs.js files.

See the README.md for more information.

nut-score/shell.nix

@@ -0,0 +1,8 @@
+let
+  pkgs = import <nixpkgs> {};
+in pkgs.mkShell {
+  name = "nut-score";
+  buildInputs = with pkgs; [
+    yarn
+  ];
+}