Create libcdr.rb

This formula is still incomplete.
Just wanting to see if it passes brewbot test. 
Reference issue: https://github.com/Homebrew/homebrew/issues/30383
Boost's compilation won't be changed by this formula? I'm not sure I understand. Regardless, not all of these (`needs :cxx11`, `ENV.libcxx`, `ENV.cxx11`) should be needed.