Build hybrid app for android and apple

It' s small photo gallery app where users can ( A ) open photo gallery ( B ) Select photos ( C ) see photos in predefined format ( UI is ready ) ( D ) Set the favorite photos ( E ) Share favorite photos on social media/mail ( F ) Save favorite photos in an album ( G ) Share app with friends/social media ( H ) participate in Invite & earn program ( I ) SignUp/SignIn App's UI and flow is already designed. App will be first developed for android and after beta testing and feedbacks final version for android and apple will be launched.