private static async Task <HttpResponseMessage> AssignCard(HttpClient client, string cardId, string assignee)
        {
            var command = new AssignCard
            {
                Id       = cardId,
                Assignee = assignee
            };

            var response = await client.PutAsync($"/cards/{cardId}/assignee", command.AsJsonStringContent());

            return(response);
        }
        public async Task <IActionResult> Assign(AssignCard command)
        {
            await _assignCardHandler.Handle(command);

            return(NoContent());
        }