[ADD] eCommerce: customer accounts

Adding a page on customer accounts for the eCommerce doc. Forward to
master.

closes odoo/documentation#3786

Taskid: 3223001
X-original-commit: 49b45c9aa6
Signed-off-by: Castillo Jonathan (jcs) <jcs@odoo.com>

content/applications/websites/ecommerce/checkout_payment_shipping/checkout.rst

@@ -109,6 +109,10 @@ Process`. You can choose between:
 - :guilabel:`Disabled (buy as guest)`: customers can only checkout as guests;
 - :guilabel:`Mandatory (no guest checkout)`: customers can only checkout if they have signed-in.
 
+.. seealso::
+   - :doc:`../ecommerce_management/customer_accounts`
+   - :doc:`/applications/general/users/portal`
+
 B2B access restriction
 ----------------------
 

content/applications/websites/ecommerce/ecommerce_management.rst

@@ -8,3 +8,4 @@ eCommerce management
    :titlesonly:
 
    ecommerce_management/order_handling
+   ecommerce_management/customer_accounts

content/applications/websites/ecommerce/ecommerce_management/customer_accounts.rst

@@ -0,0 +1,43 @@
+=================
+Customer accounts
+=================
+
+Having customer accounts on an eCommerce allows customers to access all their documents from a
+single place. To access their account, customers must be **logged-in** on the eCommerce website,
+click on their **username** in the top-right corner of the screen, and click :guilabel:`My Account`.
+From there, customers can access their :guilabel:`quotations`, :guilabel:`orders`,
+:guilabel:`invoices`, etc.
+
+.. image:: customer_accounts/account-log.png
+   :align: center
+   :alt: Customer account log-in
+
+.. note::
+   Customers can only have an account if the :ref:`sign in/up at checkout <checkout-sign>` option
+   allows for accounts creation.
+
+.. tip::
+   Similarly to the rest of the website, the customer account page can be customized with **content
+   blocks** and other features through the **website builder**.
+
+.. seealso::
+   :doc:`/applications/general/users/portal`
+
+Access restriction
+==================
+
+It is possible to allow or restrict the documents to which customers have access through the website
+builder. Log in your **own** account with your Odoo database credentials, and go to
+:menuselection:`Edit --> Customize`. From the website builder menu, enable or disable the documents
+customers can have access to.
+
+.. image:: customer_accounts/account-documents.png
+   :align: center
+   :alt: Documents to which customers have access to from their account
+
+Multi-website account
+=====================
+
+If you own multiple websites, you can make customer accounts available across **all** websites.
+Then, the customer only needs one account. To do so, go to :menuselection:`Website --> Configuration
+--> Settings --> Privacy section`, and enable :guilabel:`Shared Customer Accounts`.