create static method
Factory method creating placement.
Implementation
static Future<AppOpenAdPlacement> create({required String name}) async {
  final placement = AppOpenAdPlacement._(name: name);
  try {
    await AatkitFlutterPluginPlatform.instance
        .createAppOpenAd(name, placement);
  } on PlatformException catch (e) {
    aatkitLog("PlatformException, error: $e");
  }
  return placement;
}