[ADD] inventory: add V13 doc "receive products in stock"

inventory/overview/process.rst

@@ -7,3 +7,4 @@ Process Overview
    :glob:
 
    process/sale_to_delivery
+   process/receive_in_stock

inventory/overview/process/receive_in_stock.rst

@@ -0,0 +1,64 @@
+=========================
+Receive Products in Stock
+=========================
+
+The first step to use the inventory application is to create products in
+your database via the menu *Master Data > Products*. Click the Create
+button and enter the name of your product.
+
+.. image:: media/receive_in_stock_01.png
+    :align: center
+
+In case you set the product as *storable*, you will track the stock
+for this product and know how many units are in stock and what is the
+forecasted number of units. If you want to include a product on
+receipts/deliveries but don’t need to track its stock, you can set it as
+*consumable*.
+
+.. image:: media/receive_in_stock_02.png
+    :align: center
+
+Receive Products in Stock
+=========================
+
+Once you have existing products, you can decide to create a receipt to
+enter products from your supplier in stock. The process in order to do
+so is described in the following print screens.
+
+.. image:: media/receive_in_stock_03.png
+    :align: center
+
+.. image:: media/receive_in_stock_04.png
+    :align: center
+
+On the receipt document, you can select the quantity of the different
+products you receive and the supplier from who you received them. When
+the receipt is complete, you can hit *Validate* and the products will
+enter your stock.
+
+.. image:: media/receive_in_stock_05.png
+    :align: center
+
+In case you have a receipt that is planned but shouldn’t be immediately
+validated, you can create a *planned receipt* with a scheduled date in
+the future. You can indicate the initial demand for each product,
+corresponding to what has been ordered to your supplier. Once the
+document is filled in, you can hit “Mark as to do” in order to consider
+it in your product forecasts.
+
+.. image:: media/receive_in_stock_06.png
+    :align: center
+
+.. image:: media/receive_in_stock_07.png
+    :align: center
+
+Receive Products in Stock from Purchase Orders
+==============================================
+
+If you have the *Purchase* application installed, receipts can be
+directly created by validating a *request for quotation*. You will be
+able to find the corresponding receipt directly on the *purchase
+order*.
+
+.. image:: media/receive_in_stock_08.png
+    :align: center