already create git repository from local project code example

Example 1: create repository in github using command line

git init
git add somefile
git commit -m "initial commit"
git remote add origin https://github.com/username/new_repo
git push -u origin master 

# New local repository
git init
git add .
git commit -m "Initial commit"

# New remote repository
# Create remote repository (likely on github), then:
git remote add origin https://github.com/username/new_repo #https
git remote add origin git@github.com:username/new_repo #ssh
# Now push
git push -u origin master

Example 2: how to make a folder into git repo

$ git remote add origin git@github.com:username/new_repo
$ git push -u origin master