The previous step didn't do anything with our application. It is time to add them to the repo now.
In your terminal, try:
$ git status
$ git add .
$ git commit -m "Added all the things"
$ git status
git status tells you everything git sees as modified, new, or missing.
git add . tells git that you want to add the current directory (aka .) and everything under it to the repo.git commit tells git to actually do all things you've said you wanted to do.
-m "Added all the things" is just a shortcut to say what your commit message is. You can skip that part and git will bring up an editor to fill out a more detailed message.