void Main()
{
IMediator mediator = new ConcreteMediator();
ColleagueA talkColleague = new ColleagueA(mediator);
ColleagueB fightColleague = new ColleagueB(mediator);
talkColleague.DoSomething();
fightColleague.DoSomething();
}
public void RegisterB(ColleagueB cB)
{
fight = cB;
}