private static void Listing()
        {
            Console.WriteLine("Listing Series");
            var list = repository.Listing();

            if (list.Count == 0)
            {
                Console.WriteLine("No series yet");
                return;
            }

            foreach (var serie in list)
            {
                Console.WriteLine($"- ID {serie.Id}: {serie.Title} {(serie.Removed ? "*Removed*" : "")}");
            }
        }