Adding:
* AnkhMorpork.Witches.Domain assembly and entities
* AnkhMorpork.Witches.BusinessServices assembly and business services for entities
* AnkhMorpork.Witches.Rules assembly and rules for entities
* AnkhMorpork.Witches.Common assembly and ExceedingTheMaximumNumberOfPlayersException

Implementation of:
* IGameService.StartNewGame method
* ICackleService.Setup method
* ICrisisService.Setup method
* ICackleRules
* ICrisisRules