Add nix shell

Author: Daniils Petrovs

.envrc

@@ -0,0 +1 @@
+use nix

shell.nix

@@ -0,0 +1,4 @@
+{ pkgs ? import <nixpkgs> {} }:
+  pkgs.mkShell {
+    nativeBuildInputs = with pkgs.buildPackages; [ clojure leiningen chromedriver ];
+}