[ADD] ecommerce: How to display several images per product

ecommerce/managing_products.rst

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+=================
+Manage your products
+=================
+
+.. toctree::
+   :titlesonly:
+
+   managing_products/multi_images
+   managing_products/variants
+   managing_products/stock
+   ../../sales/products_prices/products/import
+

ecommerce/managing_products/multi_images.rst

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+=========================================
+How to display several images per product
+=========================================
+
+By default your product web page displays the main image of your product only.
+If you like to show your products under several angles, you can turn the image into a carrousel.
+
+.. image:: ./media/multi_images01.png
+   :align: center
+
+* Check *Several images per product* in :menuselection:`Website Admin --> Configuration --> Settings`.
+
+* Open a product detail form and upload images from *Images* tab. Hit *Create* in Edit mode to get the upload wizard.
+
+.. image:: ./media/multi_images02.png
+   :align: center
+
+.. note:: 
+    Such extra image are common to all the product variants (if any).