[ADD] ecommerce: How to customize your catalog page

ecommerce/getting_started/catalog.rst

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+==================================
+How to customize your catalog page 
+==================================
+
+Product Catalog
+===============
+
+All your published items show up in your catalog page (or *Shop* page).
+
+.. image:: ./media/shop.png
+   :align: center
+
+Most options are available in the *Customize* menu: display attributes,
+website categories, etc.
+
+.. image:: ./media/shop_customize.png
+   :align: center
+
+Highlight a product
+===================
+
+Boost the visibility of your star/promoted products: push them to top, make them
+bigger, add a ribbon that you can edit (Sale, New, etc.). Open the Shop page, switch
+to Edit mode and click any item to start customizing the grid.
+
+See how to do it: https://www.odoo.com/openerp_website/static/src/video/e-commerce/editing.mp4
+
+Quick add to cart
+=================
+
+If your customers buy a lot of items at once, make their process shorter by enabling purchases from
+the catalog page. To do so, add product description and add to cart button. Turn on the following
+options in *Customize* menu:  Product Description, Add to Cart, List View (to display product
+description better).
+
+.. image:: ./media/shop_list.png
+   :align: center