Extract constant for Gold coins to win

Signed-off-by: Igor Popov <igor.popov@napa.fi>
Renamed the notAWinner to gameOver, modified the boolean

Signed-off-by: Igor Popov <igor.popov@napa.fi>
Move the run method in the game class

Signed-off-by: Igor Popov <igor.popov@napa.fi>