public IActionResult AddItem([FromBody] Item newItem)
 {
     if (ModelState.IsValid)
     {
         try
         {
             var id = acontext.AddItem(newItem);
             if (id > 0)
             {
                 return(Ok(id));
             }
             else
             {
                 return(NotFound());
             }
         }
         catch (Exception)
         {
             return(BadRequest());
         }
     }
     return(BadRequest());
 }