static void Main(string[] args)
{
var mediator = new ConcreteMediator();
mediator.Colleague1 = new Colleague1(mediator);
mediator.Colleague2 = new Colleague2(mediator);
mediator.Send("Hello world this - colleage 1 message", mediator.Colleague1);
mediator.Send("Hello world this - colleage 2 message", mediator.Colleague2);
Console.ReadKey();
}