static void Main(string[] args)
        {
            BookListService books = new BookListService("test.txt");

            books.Show();

            try
            {
                books.AddBook(new Book { Author = "Author1", Title = "Title2", PublishingHouse = "House", Year = 1994 });
            }
            catch (BookException exc)
            {
                logger.Error(exc.Message, exc);
            }

            try
            {
                books.RemoveBook(new Book { Author = "Authorr", Title = "Title", PublishingHouse = "Publishing", Year = 1923 });
            }
            catch (BookException exc)
            {
                logger.Error(exc.Message, exc);
            }

            System.Console.WriteLine();
            books.Show();
        }