Test funcional: 6 jugadores -> rojo
Implementar fix para 6 jugadores -> verde
Test funcional: getPlayers -> rojo
Implementar getPlayers -> verde
Test funcional: removePlayers -> rojo
Implementar fix para remove() -> verde
Refactor: unificar question types -> verde
Refactor: extraer clase Question -> verde
Refactor: simplificar wasCorrectlyAnswered() -> verde
Refactor: añadir category por numero dentro de Question -> verde