[ADD] inventory: How to use packages?

https://docs.google.com/document/d/1V5As26XiZT-71EGltKyz1Yz4GiSKWBkpXuyq5wJbxqQ/edit?usp=sharing

inventory/settings/products/packages.rst

@@ -1,3 +1,108 @@
 ====================
 How to use packages?
-====================
+====================
+
+Overview
+========
+
+The package is the physical container in which you put one or several
+product.
+
+By default, Odoo does not take into account the use of it.
+
+Once you activate the option, you will be able to manage one or several
+packages when doing your transfers.
+
+Configuration
+=============
+
+To configure the use of packages, go to the menu 
+:menuselection:`Inventory --> Configuration --> Settings`. µ
+Locate the **Packages** section and tick **Record
+packages used on packing: pallets, boxes,...**
+
+.. image:: media/packages01.png
+    :align: center
+
+Click on **Apply** when you are done.
+
+Pack products
+=============
+
+Putting products in packs is usually done when processing warehouses
+transfers (receipt, internals or deliveries).
+
+To be able to put products in pack, the status of your transfer has to
+be **Available**.
+
+.. image:: media/packages02.png
+    :align: center
+
+In the operation tab, you can put your products into one or
+multiple packages.
+
+Choose the quantity you want to put in the first pack in the **Done**
+column, then click on the link **Put in Pack**.
+
+.. image:: media/packages03.png
+    :align: center
+
+It will automatically create a pack with the requested quantity.
+
+Do the same steps for the other pieces you want to pack in.
+
+.. image:: media/packages04.png
+    :align: center
+
+Click on **Validate** when you are done.
+
+Whole packages transfers 
+=========================
+
+If you are using several locations and/or warehouses, it is possible to
+transfer packages with its contents.
+
+Configuration
+-------------
+
+You need to configure the **Operation Type** to allow moving packages. Go to
+:menuselection:`Configuration --> Operations Types`. Tick **Allow moving packs**:
+
+.. image:: media/packages05.png
+    :align: center
+
+Transfer packages
+-----------------
+
+Create a transfer order. Choose the source and the destination
+locations, then click on **Mark as todo**. Do not put anything under
+the **Initial Demand** tab.
+
+.. image:: media/packages06.png
+    :align: center
+
+In the Operation tab, click on **Add an item** under the **Package To Move**
+section.
+
+Tick the **Done** checkbox to confirm the move of the package :
+
+.. image:: media/packages07.png
+    :align: center
+
+When it is finished, click on **Validate**.
+
+Packages traceability
+=====================
+
+To trace a package or check its content, go to 
+:menuselection:`Inventory Control --> Packages`.
+
+.. image:: media/packages08.png
+    :align: center
+
+Click on **Package Transfers** to see all its moves.
+
+.. seealso::
+    * :doc:`../../overview/start/setup`
+    * :doc:`usage`
+    * :doc:`uom`