Time to implement the shopping cartIn this module...Requirement - Add items to cartImplement "Add to Cart" in the frontendCreate an API endpoint for adding items to a cartRequirement - There can be only one cart per "session"Store the sessionId in local storage (frontend)Refactor AddToCart logic out of the controllerEnsure only one cart per sessionTest adding to cart in the browser (and squash some bugs)Requirement - Small tweaks to the UIVisual feedback on AddPractice Feature - Disable the button when clickedIncrement existing cart line quantityPractice Feature - Adding more than one at a timeUpgrading to a later version of React.js