Add data docs

docs/data.md

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+# Game Data
+There are two types of data that is used in the game:
+- player data
+- simulation data
+
+## Player Data
+The player data is only available to the player and contains the player´s hand cards only. It is stored directly in the players object. All other information is available for all players and is stored in the simulation data.
+
+## Simulation Data
+The simulation data is available to all players and contains all information about the simulation. It is stored in the game object as `Data` and is passed to the player in the `turn` function. The player can use this information to make a decision.
+`Data` is a struct of the following form:
+- number of players (int)
+- game data (struct)
+- round data (struct)
+- bet round data (struct)
+
+### Game Data
+The game data contains information about one poker game (until only one player is not out yet). It is stored in the `GameData` struct and has the following form:
+- number of chips per player (int[])
+- bool array of players who are out (bool[])
+
+### Round Data
+The round data contains information about one round (until the pot is won). It is stored in the `RoundData` struct and has the following form:
+- small blind (int)
+- big blind (int)
+- add blind (int, which is added to the small blind after the button has moved one time around the table)
+- dealer position (int)
+- pot (int)
+- bool array of players who folded (bool[])
+- community cards (Card[])
+- OutEnum which represents the state of the round (OutEnum)
+
+### Bet Round Data
+The bet round data contains information about one bet round (until all players have bet the same amount). It is stored in the `BetRoundData` struct and has the following form:
+- position of the player who has to act (int)
+- current bet (int)
+- player bets (int[])