$27.$ Implement play

The function play starts out by displaying the initial number of credits. It uses get$\_$bet to ask for a bet, and then plays a session of Quasar. It then adds the winnings $($or loss$)$ to the credits. If the player is not broke, the game asks to continue or payout. If the player choses a payout, the function prints the final number of credits before quitting.

For example, here is a game in which the player chooses a payout after one session.