Time to implement the shopping cartIn this module...Requirement - There can be only one cart per "session"Practice Feature - Adding more than one at a timeRefactor AddToCart logic out of the controllerTest adding to cart in the browser (and squash some bugs)Ensure only one cart per sessionImplement "Add to Cart" in the frontendRequirement - Add items to cartPractice Feature - Disable the button when clickedVisual feedback on AddCreate an API endpoint for adding items to a cartUpgrading to a later version of React.jsRequirement - Small tweaks to the UIStore the sessionId in local storage (frontend)Increment existing cart line quantity