public ActionResult AddStaff([FromBody] Staff s)
 {
     if (StaffRepo.Add(s))
     {
         return(Ok("Staff has been successfully added"));
     }
     return(BadRequest("The Staff has already been added"));
 }
 public IActionResult AddStaff([FromBody] StaffModel staff)
 {
     if (StaffRepo.Add(staff))
     {
         return(Ok($"Successfully added {staff.name} to staff."));
     }
     else
     {
         return(BadRequest("This member of staff already exists."));
     }
 }