[ADD] inventory: How to Process a Delivery Order in One Step (Shipping)

https://docs.google.com/document/d/1rvAApr1pg8sM_0VnvZjXhW2zXoLzpLt58S-3QtAm-JA/edit

inventory/delivery/one_step.rst

@@ -1,3 +1,67 @@
 ======================================================
 How to process delivery orders in one step (shipping)?
-======================================================
+======================================================
+
+Overview
+========
+
+When an order goes to the shipping department for final delivery, Odoo
+is set up by default to utilize a one-step operation: once all goods are
+available, they are able to be shipped in a single delivery order.
+
+Configuration
+=============
+
+There is no configuration needed. The default outgoing shipments are
+configured to be directly delivered from the stock.
+
+However, if **advance routes** is activated and you set another shipping
+configuration on your warehouse, you can set it back to the one-step
+delivery configuration. Go to :menuselection:`Configuration --> Warehouses` 
+and edit the concerned warehouse.
+
+Set the outgoing shippings the option to **Ship directly from stock
+(Ship Only)**
+
+.. image:: media/one_step01.png
+   :align: center
+
+Create a Sales Order
+====================
+
+Create a sales order (From quotation to sales order) with some products
+to deliver.
+
+Notice that we now see ``1`` delivery associated with this sales order
+in the **stat button** above the sales order.
+
+.. image:: media/one_step03.png
+   :align: center
+
+If you click on the **1 Delivery** stat button, you should now see your
+picking.
+
+Process a Delivery
+==================
+
+Go to **Inventory** and click on the **# TO DO** link under the
+**Delivery Orders** kanban card.
+
+.. image:: media/one_step02.png
+   :align: center
+
+Click on the picking that you want to process.
+
+Click on **Validate** to complete the move from **WH/Output** to the
+**customer**.
+
+This has completed the **Shipping Step** and the WH/OUT should now show
+**Done** in the status column at the top of the page, which means the
+product has been shipped to the customer.
+
+
+.. todo::
+    Ajouter un lien vers ces pages quand elles existeront
+    -  Process Overview: From sales orders to delivery orders
+
+    -  Process Overview: From purchase orders to receptions