Add a HUD with important infos / buttons

[fry-]

the free space on the bottom of the screen is reserved for the missing HUD. It should contain:

• display to show the time and the amount of obstacles the player has passed
• two buttons, one for Jump and one for Duck ( so it can be played on mobile). One button on left bottom, the other on right bottom.
• one button to quit / go back to the main screen (small button in the bottom middle, between the jump/duck buttons)