modify cart.js
add getCartItemCounts method in CartItemService
modify cartCounts show
modify cartCounts name
can can delete item
modify change category
can not add the same category
refactor
format
refactor add product
can modify an iten and refactor
delete useless codes
cart operation is ok
refactor and delete useless method
modify
can add to cart by POST request
add getCartItem method and impl
implement getCartItem and GET method
add deleteCartItems method in CartItemDatabaseDao
implement deleteCartItems method in CartItemDatabase