public async Task <MessageResponse> SendToGroup(MessageViewModel message)
        {
            CoreEngine core = new CoreEngine();

            DomainCore.Models.MessageModel m = new DomainCore.Models.MessageModel
            {
                SenderName = message.SenderName,
                GroupName  = message.GroupName,
                Content    = message.Content,
                MessageDT  = DateTime.Now,
                id         = message.GroupName + DateTime.Now.ToString("yyyyMMddhhMIss")
            };

            var msg = await core.SendMessageToGroupAsync(_repo, m);

            var response = new MessageResponse {
                Message = msg
            };

            return(response);
        }