Build An Offline Restaurant Billing App

I need an Android app developed for offline billing specifically for a restaurant. The app should include: - Menu Management: Ability to add, update, or remove menu items. - Category-wise Organization: Menu items organized by categories... (Budget: $15 - $25 AUD, Jobs: Android, Android App Development, Android SDK, Android Studio, Graphic Design, Mobile App Development, Mobile Development, User Interface / IA)