Set up git
  git config --global user.name "Giovanni La Torre"
  git config --global user.email giovannilt@gmail.com

Next steps:
  mkdir tic-tac-toe
  cd tic-tac-toe
  git init
  touch README
  git add README
  git commit -m 'first commit'
  git remote add origin git@github.com:giovannilt/tic-tac-toe.git
  git push -u origin master

Existing Git Repo?
  cd existing_git_repo
  git remote add origin git@github.com:giovannilt/tic-tac-toe.git
  git push -u origin master