…or create a new repository on the command line

echo "# blog" >> README.md
git init
git add README.md
git commit -m "first commit"
git remote add origin git@github.com:piremartin/blog.git
git push -u origin master

…or push an existing repository from the command line

git remote add origin git@github.com:piremartin/blog.git
git push -u origin master

…or import code from another repository