##…or create a new repository on the command line

echo "# notes" >> README.md
git init
git add README.md
git commit -m "first commit"
git remote add origin https://github.com/jamescth/notes.git
git push -u origin master

##…or push an existing repository from the command line

git remote add origin https://github.com/jamescth/notes.git
git push -u origin master