Add readme
Add 'markit/' from commit '2c4a70878362cae00fcf95758224513ea9c63f69'

git-subtree-dir: markit
git-subtree-mainline: 268bae885977c163ddd1c822e8353892cb1a0f89
git-subtree-split: 2c4a70878362cae00fcf95758224513ea9c63f69