public IActionResult UpdateApp(string appId)
        {
            OneSignalAppsViewModel app = appRepo.GetAppById(appId);

            ViewBag.AppData = app;
            return(View());
        }
        public async Task <IActionResult> EditApp(OneSignalAppsViewModel updatedAppData)
        {
            await appRepo.UpdateApp(updatedAppData);

            return(RedirectToAction("Index"));
        }