public ResponseModel <IEnumerable <GroupModel> > Get()
        {
            var resp = new ResponseModel <IEnumerable <GroupModel> >();

            try
            {
                var appList = AppRepo.GetGroupsModel().ToList();

                if (appList.Any())
                {
                    resp.Data        = appList;
                    resp.Status      = 200;
                    resp.Description = "OK";
                }
                else
                {
                    resp.Status      = 200;
                    resp.Description = "No groups";
                    resp.Data        = null;
                }
            }
            catch (Exception ex)
            {
                resp.Status      = 500;
                resp.Description = $"Error: {ex.Message}";
                resp.Data        = null;
            }

            return(resp);
        }