add CartItemServeice-spec.js file
add itemsService-spec.js file
add categoryService.js file
add goodsService.js file
add return itemsList test
add load items test
add increase count test
add reduce count test
add localStorageService set function test
add localStorageService get function test
add localStorageService remove function test
update ItemsService
add else test
add return cartList test
add return cartItems test
update CartItemService-spec.js
add reduce number test
add increase number test
add get total test
add load category test