public ActionResult <Transcript> AddGrade(StudentGrade studentGrade)
        {
            if (!ModelState.IsValid)
            {
                return(BadRequest());
            }

            if (!_studentsRepo.Exists(studentGrade.StudentID))
            {
                return(NotFound("Student not found"));
            }

            if (!_coursesRepo.Exists(studentGrade.CourseID))
            {
                return(NotFound("Course not found"));
            }


            var addedGrade = _repo.AddGrade(studentGrade);

            if (addedGrade == null)
            {
                return(BadRequest("Failed to add grade. Please check request values and try again")); // ideally we would let the consumer know exactly why the request failed
            }
            return(Created("Grade was added", addedGrade));
        }