PLEASE USE FLUTTER LANGUAGE
in this assignment you need to create shop app, given short screen of mobile shop categories as item you may choose other items if you wish,
tasks:
1. Create main dart with theme and return to categories dart file
2. categories illustrate all type of items such as mobiles (use grideview) with buttons
3 if you click on any category it will display the details description and image of mobile
4. provide left menu to display other screen such as payment, order and signup and login
5. create signup and login for form registration, your data will saved on map or list in the UI, show the validation and regular expression for username and email