git config --global user.name "xxx"
git config --global user.email "xxx"
git clone xxxxx
cd xxx
touch README.md
git add README.md
git commit -m "add README"
git push -u origin master
cd existing_folder
git init
git remote add origin xxx
git add .
git commit -m "Initial commit"
git push -u origin master
cd existing_repo
git remote rename origin old-origin
git remote add origin xxx
git push -u origin --all
git push -u origin --tags