[DOCS] `@daffodil/cart` Standardized Documentation

[xelaint]

:page_facing_up: Documentation Request

What were you doing?

Documentation for packages are not uniform and extensive enough.

Expected behavior

• [ ] Overview: What is the package's purpose? How do I install and use this package?
  • [ ] Short paragraph explaining package's purpose
  • [ ] Installation
• [ ] Usage
  • [ ] How do I retrieve the current user's cart?
  • [ ] How do I change the current cart storage mechanism for the user?
  • [ ] How do I add items user's cart?
  • [ ] How do I remove items from a user's cart?
  • [ ] How do I update the item quantity in my cart?
  • [ ] How do I change the cart driver?
  • [ ] How do I apply a promotion to my user's cart?
  • [ ] Updating a user's billing and shipping address at the same time
  • [ ] Applying a payment to the cart (probably just redirect to a payment guide)
• [ ] State
• [ ] Drivers
  • [ ] Hubspot
• [ ] Configuration
• [ ] Testing

Existing Documentation

Environment

Daffodil version: X.Y.Z
Angular version: X.Y.Z 

 
For Tooling issues:
- Node version: XX  
- Platform:  

Others:

[damienwebdev]

@griest024 can you think up some common tasks you can do with the cart package?

• [ ] How do I retrieve the current user's cart?
• [ ] How do I change the current cart storage mechanism for the user?
• [ ] How do I add items user's cart?
• [ ] How do I remove items from a user's cart?
• [ ] How do I update the item quantity in my cart?
• [ ] How do I change the cart driver?
• [ ] How do I apply a promotion to my user's cart?