public ActionResult Index(string q = null, int o = 0, int c = 50)
        {
            if (o < 0) o = 0;
            if (c < 1) o = 1;
            if (c > 100) o = 100;

            var groups = new Groups();
            var model = groups.SearchGroups(q, o, c);

            return View(model);
        }