[ADD] ecommerce: How to enable comments & rating

ecommerce/maximizing_revenue/reviews.rst

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+===============================
+How to enable comments & rating
+===============================
+
+Publishing and monitoring customer experience will help you gain the trust
+of new customers and better engage with your community. In 2 clicks, allow
+your customer to share their feedback!
+
+.. image:: ./media/comment_post.png
+   :align: center
+
+Setup
+=====
+
+Activate comments & rating from the *Customize* menu of the product web page.
+
+.. image:: ./media/comment_setup.png
+   :align: center
+
+.. note::
+    Visitors must log in to share their comments. Make sure they are able to
+    do so (see Portal documentation).
+
+Review the posts in real time
+=============================
+
+Whenever a post is published, the product manager and all the product followers
+get notified in their Inbox (*Discuss* menu).
+
+.. image:: ./media/comment_new.png
+   :align: center
+
+.. note::
+    By default the user who created the product is automatically set as follower.
+
+Click the product name to open the detail form and review the comment (in the
+product discussion thread).
+
+.. image:: ./media/comment_inbox.png
+   :align: center
+
+Moderate & unpublish
+====================
+
+You can easily moderate by using the chatter, either in the product detail form
+or on the web page.
+
+To unpublish the post, open the product web page and click the *Published* button
+to turn it red (*Unpublished*). 
+
+.. image:: ./media/comment_unpublish.png
+   :align: center
+
+..tip::
+    You can access the web page from the detail form by clicking the *Published*
+    smart button (and vice versa).
+
+.. image:: ./media/comment_webpage.png
+   :align: center