Add sudo-touchid formula

sudo-touchid.rb

@@ -0,0 +1,23 @@
+class SudoTouchid < Formula
+  desc "A fork of `sudo` with Touch ID support."
+  homepage "https://github.com/mattrajca/sudo-touchid"
+  url "https://github.com/mattrajca/sudo-touchid", :using => :git
+
+  depends_on :macos => :sierra
+  depends_on :xcode => :build
+
+  def install
+    xcodebuild 
+    bin.install 'build/Release/sudo'
+  end
+
+  def caveats; <<-EOS.undent
+        sudo requires appropriate owner and mode: 
+
+        sudo chown root:wheel #{opt_prefix}/bin/sudo
+        sudo chmod 4755 #{opt_prefix}/bin/sudo
+
+        You can also set up your PATH by adding export PATH=#{opt_prefix}/bin:$PATH to .bashrc
+    EOS
+  end
+end