Unith 3D app

We need a simple app made in Unity 3D. This project involves programming AND designing the app, though the design will be very simple. The app will start with 3 doors visible on the screen. The user chooses which door to enter. Upon tapping any door, the door will open and the user will enter the room (first person view), and a wall will appear with some text written on it. From there, the user will read the text and can exit back to the main screen (with 3 doors) again. That's about it. We can explain more in a private message.