Add section on Git workflow to guidelines
Add section on Git workflow to guidelines

alphagov/whitehall,YOTOV-LIMITED/whitehall,robinwhittleton/whitehall,robinwhittleton/whitehall,YOTOV-LIMITED/whitehall,askl56/whitehall,robinwhittleton/whitehall,hotvulcan/whitehall,ggoral/whitehall,YOTOV-LIMITED/whitehall,hotvulcan/whitehall,ggoral/whitehall,alphagov/whitehall,askl56/whitehall,ggoral/whitehall,hotvulcan/whitehall,askl56/whitehall,hotvulcan/whitehall,alphagov/whitehall,askl56/whitehall,ggoral/whitehall,alphagov/whitehall,YOTOV-LIMITED/whitehall,robinwhittleton/whitehall