Tap to reveal

Hey Philip,

I like the app, it's nice and simple. There's only one little feature I miss so I made it.

Instead of putting your phone upside down on the table and turning it around, you can also do it in the app. So when you choose your card, it wil first show the backside. Then you can put it on the table and when you're ready to reveal it you can tap it again.

I've put this in a branch because you might want to do something on it a bit before merging it into master. For example, the card backside is just an empty card, I didn't create any design for it. I'm not a very good designer anyway so it would probably be better if I don't do it.

Also maybe you want this to be a setting instead of default behaviour. But as there aren't settings in this app at all that would also take some design decisions and design. Let me know what you think.

Regards,
Rik