public async Task <ActionResult> Create(Symptom symptom)
        {
            if (ModelState.IsValid)
            {
                await _symptomService.AddAsync(symptom);

                return(RedirectToAction(nameof(Index)));
            }
            return(View(symptom));
        }
        public async Task <IActionResult> PostSymptom([FromBody] SymptomDTO symptom)
        {
            if (!ModelState.IsValid)
            {
                return(BadRequest(ModelState));
            }

            symptom = await _symptomService.AddAsync(symptom);

            return(CreatedAtAction("GetSymptom", new { id = symptom.SymptomId }, symptom));
        }