Update README.md

Author: shalithasuranga

README.md

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 # react-native-ecommerce
 A minimal React Native e-commerce app template
+
+This project provides a minimal starter project structure for your next awesome e-commerce app. 
+
+- Screens: products list, details, and shopping cart summary.
+- Simple state management with React Context API.
+- Easy to extend with additional features.
+- A mock API service for product data.
+
+## Sample Screens
+
+### Products List
+![Products List](./docs/productsList.png)
+
+### Product Details
+![Product Details](./docs/productDetails.png)
+
+### Shopping Cart Summary
+![Shopping Cart Summary](./docs/cart.png)
+
+## Credits
+
+- Sample screens design: [MockUPPhone](https://mockuphone.com) and [Canva](https://www.canva.com).
+- Product images: [Unsplash](https://unsplash.com/)
+
+