push code to github command line

git init
git add .
git commit -m "message for the commit"
git remote add origin https://url-of-github-repo
git push origin master or git push -f origin master

git add .
git commit -m "message for the commit"
git remote add origin https://url-of-github-repo
git push origin master

git init
git add README.MD
git commit -m "commit message"
git remote add origin git url_of_github_repo
git push origin master