static void Main(string[] args)
{
ChatRoom chatroom = new ChatRoom();
User user1 = new User(chatroom, "1", "Alex");
User user2 = new User(chatroom, "2", "Brian");
User user3 = new User(chatroom, "3", "Charles");
User user4 = new User(chatroom, "4", "David");
chatroom.addUser(user1);
chatroom.addUser(user2);
chatroom.addUser(user3);
chatroom.addUser(user4);
user1.send("Hello brian", "2");
user2.send("Hey buddy", "1");
}
