[ADD] inventory: How to manage stock that you don't own?

https://docs.google.com/document/d/1ubFKivYHRKZ8otgl1kqTz58ZCwR0Qg7YAbbemTeiju0/edit

inventory/misc/owned_stock.rst

@@ -1,3 +1,40 @@
 =======================================
 How to manage stock that you don't own?
-=======================================
+=======================================
+
+Introduction
+============
+
+Some suppliers can sometimes offer you to store and sell products
+without having to buy those items: this technique is called **consignee
+stock**.
+
+Consignee stock is a great way for manufacturers and suppliers to launch
+new products. As resellers may be reluctant to buying a product that
+they are not sure to be able to sell, consignee stock will allow them to
+propose an item to check its market without having to pay for it in the
+first place.
+
+Odoo has the ability to manage consignee stocks through the advanced
+settings.
+
+Configuration
+=============
+
+Open the menu :menuselection:`Inventory --> Configuration --> Settings`, 
+and in the **Product Owners** section, select **Manage consignee stocks (advanced)**,
+then click on **Apply**.
+
+.. image:: media/owned_stock02.png
+   :align: center
+
+Reception of Consignee Stock
+============================
+
+In the Inventory's Dashboard, open the **Receipts** and create a new
+reception. You can see that in the right side of the page, a new
+**Owner** line has appeared. You can specify the partner which owns the
+stock or leave it blank if you are the owner.
+
+.. image:: media/owned_stock01.png
+   :align: center