Added Texas Hold'em Poker App

[Oreig403]

Here are some sample images:

[Yaya-Cout]

Thanks for the app !
I just quickly read the code, seems fine. You didn't commit the binary file needed to install the app from the website (app.elf) and the name of the app in apps/apps.js is wrong so icon display on the list and app installation won't work anyway (the name is used to know the path of the files), but I will fix that after merging.