public Books AddBook(Books book)
        {
            context.Books.Add(book);
            context.SaveChanges();

            return(book);
        }
        public Authors DeleteAuthor(int id)
        {
            var authorForRemove = context.Authors.FirstOrDefault(b => b.IdAuthor == id);

            if (authorForRemove != null)
            {
                context.Authors.Remove(authorForRemove);
                context.SaveChanges();
            }

            return(authorForRemove);
        }