public async Task <IActionResult> AddMembers([FromBody] IEnumerable <string> emailList, [FromRoute] Guid groupId)
        {
            var _userId = this.HttpContext.User.Claims.First(c => c.Type == "sub").Value;
            await _groupMemberService.AddMembersToGroupByEmailsAsync(emailList, groupId);

            return(Ok());
        }