Implement "Proceed to Checkout" Flow and "Payment UI"

[Blessy-B-Sherin]

With the "Add to Cart" functionality being implemented, I would like to extend the functionality by developing the "Proceed to Checkout" flow and a comprehensive payment UI. This will enhance the user experience by allowing them to complete their purchase after adding items to the cart.

Requirements:

1. Proceed to Checkout Button:

   • Add a "Proceed to Checkout" button on the cart page or cart popup/sidebar.
   • When clicked, navigate users to the checkout page.

2. Checkout Page:

   • Display a summary of the products added to the cart (with quantities and prices).
   • Allow users to modify the items directly on the checkout page (change quantity, remove items, etc.).

3. Payment UI:

   • Implement a form for users to enter payment details.
   • Provide options for different payment methods (credit card, PayPal, etc.).
   • Create a responsive and user-friendly design for the payment process.