CoinFlips & Database Fun 🎉

[chrislennon]

To start implementing features state of events will need to be tracked.

This PR starts to implement a database model using sequelize. This should allow for on disk sqlite3 and any implementation chosen for the production systems - on disk or actual database.

Coin Flip: An event where many users can enter, staking x Satoshis, random number generator decides the winner which takes the pool.

CoinFlip event creation

• User should be able to create a CoinFlip event using a /coinflip [number of players] [number of sats for entry] command
• CoinFlip listing should hold the creators discord ID, interaction ID, entry fee, number of players
• User should only have one active CoinFlip at a time - CoinFlips should have an status open/closed/completed field
• Creator should be able to cancel a CoinFlip

CoinFlip event joining

• User should be able to select the join button creating them a record of entry
• This record should save the discord Id, interaction ID
• User should not be able to join if balance is insufficient
• User should not be able to join more than once
• On addition of the last entrant disable further joiners

CoinFlip Execution

• When number of entrants == max number of players execute the dice roll
• Subtract balance from losers, credit to winner
• Post winning text in the discord event body

Notes & edge cases

• User may have balance at time of entry but no balance to pay winners at execution/completion time