I would just make the project a webapp, and make sure that the site works well on mobile. Later on, when you have traction, and probably users, you can code up a native app for it (or if you have a lull of things to do and get bored :P)
Not to nitpic, but could you edit it to put the screenshots of the same thing next to each other? So I can see side by side what the iOS version of a screen looks like next to the Android version of a screen?
The article also seems to indicate that their repository strategy is not properly set up for something like this.
Most people, I think, would initially set up a separate repository for iOS and for Android, given that they are different codebases, and you wouldn't want commit history pollution. But if you're planning on reusing a lot, like in this project, it might make sense to have them both in one repo. Or have a third for shared code, and include that in each individual one?