//*******************************************
        //uSer interfaernece to addcar
        //*******************************************
        public void AddCar()
        {
            Console.Write("Enter Car Brand:");
            string brand = Console.ReadLine();

            Console.Write("Enter Car Model:");
            string model = Console.ReadLine();

            Console.Write("Enter Car Registration Plate No:");
            string plate = Console.ReadLine();

            Console.Write("Enter Car Engine No:");
            string Engine = Console.ReadLine();

            Console.Write("Enter Car purchase Price:");
            float PurchasePrice = float.Parse(Console.ReadLine());

            Console.Write("Enter Car sale Price:");
            float saleprice = float.Parse(Console.ReadLine());
            Car   c         = new Car(brand, model, plate, Engine, PurchasePrice, saleprice);

            d.AddCar(c);
        }