added cart and store components

shopping-cart/src/components/productCollection.jsx

@@ -0,0 +1,19 @@
+import Product from "./products";
+import PropTypes from "prop-types";
+
+export default function ProductCollection({ loading, items }) {
+  return (
+    <div>
+      {!loading
+        ? items.map((item, index) => {
+            return <Product item={item} key={index} />;
+          })
+        : null}
+    </div>
+  );
+}
+
+ProductCollection.propTypes = {
+  loading: PropTypes.bool,
+  items: PropTypes.array,
+};