https://stackoverflow.com/questions/28429819/rejected-master-master-fetch-first
Command line instructions
Git global setup
git config --global user.name "Fathul Muiin" git config --global user.email "fmuiin14@gmail.com"
Create a new repository
git clone git@gitlab.com:fmuiin14/proatt.git
cd proatt
touch README.md
git add README.md
git commit -m "add README"
git push -u origin master
Existing folder
cd existing_folder
git init
git remote add origin git@gitlab.com:fmuiin14/proatt.git
git add .
git commit -m "Initial commit"
git push -u origin master
Existing Git repository
cd existing_repo
git remote rename origin old-origin
git remote add origin git@gitlab.com:fmuiin14/proatt.git
git push -u origin --all
git push -u origin --tags