How do I get git to default to ssh and not https for new repositories

These days when I create a new repository on GitHub on the setup page I get:

git remote add origin https://github.com/nikhilbhardwaj/abc.git
git push -u origin master

And whenever I have to push a commit I need to enter my GitHub username and password.

I can manually change that to

git@github.com:nikhilbhardwaj/abc.git

in the .git/config. I find this quite irritating – is there some way I can configure git to use SSH by default?