frontend: selected product

[prajwalpkn]

• [x] 1. Handle click on product and update current selectedProduct state.
• [x] 2. UI for the image, title, price and bulleted description
• [ ] 3. Fallback image in case of non availability
• [x] 4. Back button to go back to all products

[prajwalpkn]

UI Implemented with back button functionality. Redux integrated with component.