[ADD] ecommerce: How to build a product page

ecommerce/getting_started.rst

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+=================
+Getting Started
+=================
+
+.. toctree::
+   :titlesonly:
+
+   getting_started/product_page
+   getting_started/catalog
+

ecommerce/getting_started/product_page.rst

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+============================
+How to build a product page
+============================
+
+On the website click *New Page* in the top-right corner.
+
+Then click *New Product* and follow the blinking tips.
+
+.. image:: ./media/create_product.png
+   :align: center
+
+Here are the main elements of the Product page:
+
+.. image:: ./media/product_page_tips.png
+   :align: center
+
+Many elements can be made visible from the *Customize* menu.
+
+.. image:: ./media/product_customize.png
+   :align: center
+
+See how to configure your products from links here below.
+
+.. seealso::
+
+  * :doc:`../managing_products/variants`
+  * :doc:`../../sales/products_prices/taxes`
+  * :doc:`../managing_products/stock`
+  * :doc:`../maximizing_revenue/cross_selling`
+  * :doc:`../maximizing_revenue/reviews`
+  * :doc:`../maximizing_revenue/pricing`
+  * :doc:`../../website/optimize/seo`
+