move code examples to Code/README.md
move code examples to Code/README.md

This will be pulled into both the jazzy-generated API docs and the boilermaker-generated README.md at the repo level

emaloney/CleanroomLogger,railsdog/CleanroomLogger,LiuDeng/CleanroomLogger,emaloney/CleanroomLogger,LiuDeng/CleanroomLogger,railsdog/CleanroomLogger