feat: example of build error from main.m

Author: Kudo

ios/CustomAppDelegate.h

@@ -1,6 +1,10 @@
 #pragma once
 
+#if __cplusplus
+
 #import <React-RCTAppDelegate/RCTAppDelegate.h>
 
 @interface CustomAppDelegate : RCTAppDelegate
 @end
+
+#endif