Rack Routes and GET Params

We've provided the code for a basic list of items. Now it's your turn to extend it.

Instructions

1. Create a new class array called @@cart to hold any items in your cart
2. Create a new route called /cart to show the items in your cart
3. Create a new route called /add that takes in a GET param with the key item. This should check to see if that item is in @@items and then add it to the cart if it is. Otherwise give an error

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