Update hello_world example to new template (#10287)

diff --git a/examples/hello_world/ios/Runner/GeneratedPluginRegistrant.h b/examples/hello_world/ios/Runner/GeneratedPluginRegistrant.h
new file mode 100644
index 0000000..3b700eb
--- /dev/null
+++ b/examples/hello_world/ios/Runner/GeneratedPluginRegistrant.h
@@ -0,0 +1,14 @@
+//
+//  Generated file. Do not edit.
+//
+
+#ifndef GeneratedPluginRegistrant_h
+#define GeneratedPluginRegistrant_h
+
+#import <Flutter/Flutter.h>
+
+@interface GeneratedPluginRegistrant : NSObject
++ (void)registerWithRegistry:(NSObject<FlutterPluginRegistry>*)registry;
+@end
+
+#endif /* GeneratedPluginRegistrant_h */