static void Main(string[] args)
        {
            // Create tyre
            Tyre tyre1 = new Tyre { Name = "Nokia", Model = "Hakka", Size = "205R16" };
            Tyre tyre2 = new Tyre { Name = "Nokia", Model = "Hakka", Size = "225R16" };

            // Create a car
            Vehicle car = new Vehicle { Name = "Porsche", Model = "911" };
            car.AddTyre(tyre1); // Car contains tyres..
            car.AddTyre(tyre1); // Car contains tyres..
            car.AddTyre(tyre2); // Car contains tyres..
            car.AddTyre(tyre2); // Car contains tyres..

            Console.WriteLine(car.ToString());

        }
 public void AddTyre(Tyre tyre)
 {
     Tyres.Add(tyre);
 }