Add functionality in the usual way, e.g. adding and committing code changes.
Submitting for code review
When ready for review, push the branch upstream
git push -u origin feature-ABC
On logging in to this service, you will be able to submit a merge request, and assign a user from the list of developers. Most merge requests will target the develop branch, unless e.g. hot-fixes which will target the master branch directly.
Direct addition to the repository
If no code review is required, the feature branch can be merged in the local repository directly and pushed upstream to the relevant branch, e.g.
git checkout develop
git merge feature-ABC
If the branch is no longer needed, delete it!
git branch -d feature-ABC
Periodically when code in the 'develop' branch is stable, merge the develop branch into the 'master' branch. Similarly, the 'develop' branch will be updated from the 'foundation' branch.