Add nix dev shell

Author: ThibaultLemaire

shell.nix

@@ -0,0 +1,11 @@
+{ pkgs ? import <nixpkgs> {} }:
+
+with pkgs;
+mkShell {
+  buildInputs = [
+    emscripten
+    nodejs
+    rustup
+    SDL2
+  ];
+}