Mobil Agriculture Marketplace App Creation

I want to build a mobile marketplace app for farmers. The idea is similar to OLX but focused only on agriculture. In this app, farmers should be able to buy and sell: • Animals (cow, buffalo, goat, sheep, poultry) • Crops (rice, wheat, vege, tables, fruits) • Farm equipment (tractor, tools, machines) Main features I need: 1. User registration using phone number and OTP. 2. Categories: Animals, Crops, and Farm Equipment. 3. Users can post ads with photos, price, description, and location. 4. Buyers can browse listings and search by category and location. 5. Product details page showing images, price, seller info. 6. Button to call or chat with the seller. 7. User profile where users can see and manage their ads. The app should be simple and easy for farmers to use. I want to build the Android version first. Please tell me: • What technology you will use • Total cost • Development time • If you will provide the full source code • If you can help publish the app to the Play Store Thank you.

Project ID: 40292262