Add item to cart
POST http://localhost:3002/{{memberId}}/cart
A POST to the /:memberId/cart endpoint allows your application to add an item to the specified member's cart. 
Look under Examples to view an example response.
HEADERS
| Key | Datatype | Required | Description | 
|---|---|---|---|
| Authorization | string | ||
| Content-type | string | 
RESPONSES
status: Created
{"cart_id":"109","status":"item added"}