I have a GitHub project which does the same thing (a simple RogueLike game demo, an @ moving around a hardcoded map) in several different languages:
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You have to fork the project.
Forking means: cloning on the GitHub side, which allows you to have your very own code base for the SimpleRL project (to which you cannot push directly, because you aren't one of the direct contributors)
With a fork, you will be able to:
SimpleRL fork on GitHub (ensuring that others can see those new features and clone/test them themselves)SimpleRL repo (you will need to add it as a remote).SimpleRL project.