add (c)lox from Crafting Interpreters

lox.rb

@@ -0,0 +1,15 @@
+class Lox < Formula
+  desc "The Lox language from Crafting Interpreters"
+  homepage "https://craftinginterpreters.com/the-lox-language.html"
+  license "MIT"
+  head "https://github.com/munificent/craftinginterpreters.git"
+
+  def install
+    system "make clox"
+    bin.install "clox"
+  end
+
+  test do
+    system "lox"
+  end
+end