CIF-1964 - Show staged flag in product component

- add readme

README.md

@@ -18,7 +18,8 @@ See our [wiki](https://github.com/adobe/aem-core-cif-components/wiki) for usage
 
 ## Available Components
 
--   [Product](ui.apps/src/main/content/jcr_root/apps/core/cif/components/commerce/product/v1/product)
+-   [Product v1](ui.apps/src/main/content/jcr_root/apps/core/cif/components/commerce/product/v1/product)
+-   [Product v2](ui.apps/src/main/content/jcr_root/apps/core/cif/components/commerce/product/v2/product) - Magento EE only with version >= 2.4.2
 -   [Product List](ui.apps/src/main/content/jcr_root/apps/core/cif/components/commerce/productlist/v1/productlist)
 -   [Product Teaser](ui.apps/src/main/content/jcr_root/apps/core/cif/components/commerce/productteaser/v1/productteaser)
 -   [Product Carousel](ui.apps/src/main/content/jcr_root/apps/core/cif/components/commerce/productcarousel/v1/productcarousel)

ui.apps/src/main/content/jcr_root/apps/core/cif/components/commerce/product/v2/product/README.md

@@ -0,0 +1,33 @@
+<!--
+Copyright 2021 Adobe Systems Incorporated
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+-->
+Product (v2)
+====
+The version 2 of the product component extends the v1 product component by extending the v1 GraphQL query with the `staged` field introduced in Magento 2.4.2 Enterprise Edition (EE). This hence requires that the Magento backend is at least version 2.4.2 EE because the query with the `staged` field will be rejected by Magento versions not having this field in the GraphQL schema.
+
+## BEM Description
+
+In addition to the elements documented for the version 1 of the product component, version 2 introduces this extra element to display a "staged" flag. Note that this is only relevant for AEM author instances.
+
+```
+BLOCK product
+    ELEMENT productFullDetail__staged
+```
+
+## Information
+* **Vendor**: Adobe
+* **Version**: v2
+* **Compatibility**: AEM as a Cloud Service / AEM 6.4 / 6.5
+* **Status**: production-ready