Add docs for different types of push use-cases

Push master
Push a test branch
Best way to use this with different kinds of git patterns: https://www.atlassian.com/git/tutorials/comparing-workflows

No documentation file or test is named. Review the repository's existing documentation and the linked Git workflow guide first, then identify where push examples belong. Done means the docs cover pushing master, pushing a test branch, and the requested patterns for different Git workflows.

Written by the indexing model from the issue text.