Add Nix setup

Author: pmuens

shell.nix

@@ -0,0 +1,11 @@
+with import <nixpkgs> {};
+stdenv.mkDerivation rec {
+  name = "dev";
+  env = buildEnv {
+    name = name;
+    paths = buildInputs;
+  };
+  buildInputs = [
+    nodejs-12_x
+  ];
+}