So basically the app should have following pages.
1. Login/sign up page with google firebase.(bcz we have already mentioned in our document that our login and sign up will be done by google firebase).
2. Home page:- home page should have scan bill, logout, view results buttons.
3. Scan bill :- this button will use ocr technology to scan bills and extract data from it and store directly in google database.
4. View results:- this button will categoried the data into categories like food,clothes, travelling, etc . And results will be shown.
So basically what this app should do is keep a track of how much u spend on different categories monthly and will help you to understand it better.
Hope i was able to convey properly