created a shopping cart controller
added experimental code to cart controller. Added a route to the clear action of the cart
add to cart button successfully calls the add method of the cart class
made changes towards shopping cart functionality
added logic to tell the user that the product they are viewing is already in thier cart
added view cart button to shopping cart status and configured a route for viewing.
moved app/assets/stylesheets/active_admin.css.scss to vendor/assets/stylesheets/active_admin.css.scss to fix css on main site