Document and clean Dockerfile
Document and clean Dockerfile

tdd-pingis/tdd-pingpong,Heliozoa/tdd-pingpong,tdd-pingis/tdd-pingpong,Heliozoa/tdd-pingpong,tdd-pingis/tdd-pingpong,tdd-pingis/tdd-pingpong,Heliozoa/tdd-pingpong,Heliozoa/tdd-pingpong