static void Main(string[] args)
{
ProviderA room = new ProviderA();
Subscriber John = new Subscriber("John");
Subscriber Alice = new Subscriber("Alice");
Subscriber Margaret = new Subscriber("Margaret");
Moderator Claire = new Moderator("Claire");
room.AddPerson(John);
room.AddPerson(Alice);
room.AddPerson(Margaret);
room.AddPerson(Claire);
//room.Broadcast(Claire, "Merhabalar");
Claire.Broadcast("merhabalar"); // alternatif
}