GIT

* create empty branch [https://stackoverflow.com/a/34100189/9446622]
1. git checkout --orphan empty-branch
2. git rm -rf .
3. git commit --allow-empty -m "root commit"
4. git push origin empty-branch

* delete branch
 (local)
1. git branch -d meong
 (remote)
1. git push origin --delete meong