$ git config --global user.name "zoonny"
$ git config --global user.email "[email protected]"
$ git config --list

$ echo "# css" >> README.md
$ git init
$ git add README.md
$ git commit -m "first commit"
$ git remote add origin https://github.com/zoonny/css.git
$ git push -u origin master

npm install yarn -g
npm list -g | grep yarn
yarn -v

npm install create-react-app -g
yarn global add create-react-app
# yarn global list

$ create-react-app css
# or
$ npx create-react-app css