title: How to checkout to sub branch in git
body: <p>I have cloned an ongoing sample project repo from git and its main branch is 'master'. But this repo has all changes uptodate in branch 'develop' and only a 'README.md' file in  'master' branch. I got the master branch cloned using https. I need to get the changes in 'develop' branch. Please help me to figure out.</p>