public CreateCustomerCommand(CustomerStore customerStore, string customerName)
 {
     _customerStore = customerStore;
     _customerName = customerName;
 }
 static void Main(string[] args)
 {
     var store = new CustomerStore();
     // user wants to add a customer
     var createCustomerCommand = new CreateCustomerCommand(store, "Magesh");
     createCustomerCommand.Execute();
 }