//[Produces(typeof(BookDTO))]
        public async Task <ActionResult <BookDTO> > AddBook([FromBody] BookDTO bookDTO)
        {
            var book     = _mapper.Map <Book>(bookDTO);
            var checkAdd = await _librarymanager.AddBook(book);

            if (checkAdd == 0)
            {
                return(NotFound());
            }
            return(Ok(_mapper.Map <BookDTO>(book)));
        }