fun extras

Include betting
Include double down
Include Insurance
Include Splits
Allow for multiple seats at the blackjack table
Display running values of the Card totals (including ace as 11 and as 1 if their is an Ace)

Start by reading the existing blackjack game implementation and identify how cards, hands, seats, and player actions are currently represented. Define the scope and acceptance criteria for betting, double down, insurance, splits, multiple seats, and running card totals before making changes; done means the requested gameplay is supported and the totals handle aces as 1 or 11.

Written by the indexing model from the issue text.