chore: get example running in bare react-native on ios

packages/stack/example/ios/StackExample/AppDelegate.h

@@ -0,0 +1,18 @@
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+#import <UIKit/UIKit.h>
+#import <UMReactNativeAdapter/UMModuleRegistryAdapter.h>
+#import <React/RCTBridgeDelegate.h>
+#import <UMCore/UMAppDelegateWrapper.h>
+
+@interface AppDelegate : UMAppDelegateWrapper <RCTBridgeDelegate>
+
+@property (nonatomic, strong) UMModuleRegistryAdapter *moduleRegistryAdapter;
+@property (nonatomic, strong) UIWindow *window;
+
+@end