Add template

template.hs

@@ -0,0 +1,8 @@
+#! /usr/bin/env nix-shell
+#! nix-shell -p "haskellPackages.ghcWithPackages (pkgs: with pkgs; [])" -i runhaskell
+
+{-# LANGUAGE OverloadedStrings #-}
+
+main :: IO ()
+main = do
+  putStrLn "Day 1 - Part 1"