static void Main(string[] args)
{
TextChat chat = new TextChat();
IUser admin = new Admin(chat, "Иван Иваныч");
IUser user1 = new SimpleUser(chat, "Sergey");
IUser user2 = new SimpleUser(chat, "Dasha");
IUser user3 = new SimpleUser(chat, "Masha");
user2.setEnable(false);
chat.setAdmin(admin);
chat.addUser(user1);
chat.addUser(user2);
chat.addUser(user3);
user1.sendMessage("Hello, I'm user");
admin.sendMessage("Admin online!!!");
}