Text-based Slot Machine

1. User deposits a certain amount of money.
2. Add that to their balance.
3. We allow them to bet on either 1, 2, or 3 lines (for now) of slot machine.
4. Spin the slot machine.
5. Determine if they won.
6. If they got any lines, multiply their bet by the value of their line, and add tht to their balance.
7. Allow them to keep playing until they want to cash out or until they run out of money.