public ActionResult <RClientOutput> PostClient([FromBody] RClientInput client)
        {
            try
            {
                if (client == null)
                {
                    throw new RestException("Er moet een client zijn om te posten");
                }

                int id = manager.AddClient(Mapper.ToClient(client));
                return(CreatedAtAction(nameof(GetClient), new { id }, Mapper.ToRClientOutput(manager.GetClient(id))));
            }
            catch (Exception ex)
            {
                return(BadRequest(ex.Message));
            }
        }