Create your own branch, name it something specific to the feature. (i.e. enemy_ai)
Please send a GitHub Pull Request to Doom_Party with a clear list of what you've done. Make sure all of your commits are atomic (one feature per commit).
Always write a clear log message for your commits. One-line messages are fine for small changes, but bigger changes should look like this:
$ git commit -m "A brief summary of the commit
>
> A paragraph describing what changed and its impact."