public async Task <IActionResult> Add([FromBody] Managers manager)
        {
            if (manager == null)
            {
                return(BadRequest("manager failed on add "));
            }
            _repo.Add(manager);

            if (await _repo.SaveAll())
            {
                return(Ok());
            }

            throw new Exception(" manager" + manager.FirstName + " failed on add ");
        }