complete shopping cart page

[hparul]

Description

1.This PR is about displaying shopping cart page where a user can modify quantity of products in the shopping cart. 2.User can also remove any product which is added in the cart. 3.user is also able to see the total price,total discount and total amount to be payed as per the quantity and produtcs selected. 4.user can also see its own details like name ,email, an delivery information once the user logs in on the website.

Fixes #228

How to test?

Please provide a short summary how your changes can be tested? 1.run:npm run dev 2.add products from landing page to the cart. 3.check the cart button on the header to see your cart. 4.modift quantity or remove any product ,and get the total amount to be paid . 5.user can also check its details and the delivery info. 6.can also edit its information.

Checklist

• [x] I have performed a self-review of my own code
• [x] I have followed the name conventions for CSS Classnames and filenames, Components names and filenames, Style filenames, if you are in doubt check the the project README.MD and here https://github.com/HackYourFuture-CPH/curriculum/blob/master/review/review-checklist.md
• [x] I have commented my code, particularly in hard-to-understand areas, if you code was simple enough mark the box anyway
• [x] I have made corresponding changes to the documentation, if you code was simple enough mark the box anyway
• [x] This PR is ready to be merged and not breaking any other functionality

[suvarna-ratna]

have some work left on .. 1.Display My Details 2.Edit Delivery Information remaining looks fine

.