static void Main(string[] args)
{
Subject store = new Subject();
//client1 take a subscription to the store
Observver client1 = new Observver("Lucian");
store.Subscribe(client1);
//client2 take a subscription to the store
Observver client2 = new Observver("Alina");
store.Subscribe(client2);
store.Inventory++;
Console.WriteLine("------------------------");
//alina left the subscription but a new user subcripted to the store
store.Unsubsribe(client2);
store.Subscribe(new Observver("Feli"));
store.Inventory++;
Console.WriteLine("------------------------");
Console.WriteLine("Hello from observer pattern");
Console.ReadLine();
}