You can also upload existing files from your computer using the instructions below.
git config --global user.name "kreangkrai supchid"
git config --global user.email "kreang@kreangkrai.com"
git clone git@github.com:mynameiskreang/repo.git
cd repo
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 git@github.com:mynameiskreang/repo.git
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 git@github.com:mynameiskreang/repo.git
git push -u origin --all
git push -u origin --tags