[ADD] purchase: How to setup a minimum stock rule?

From https://docs.google.com/document/d/1qKlaXxOqM0EJT8TF6sspmhS692o9qR9f2s5uFuEdpnA/edit?pli=1#

purchase.rst

@@ -9,3 +9,4 @@ Purchase
 
    purchase/overview
    purchase/purchases
+   purchase/replenishment

purchase/replenishment.rst

@@ -0,0 +1,8 @@
+=============
+Replenishment
+=============
+
+.. toctree::
+   :titlesonly:
+
+   replenishment/flows

purchase/replenishment/flows.rst

@@ -0,0 +1,9 @@
+===================
+Replenishment Flows
+===================
+
+.. toctree::
+   :titlesonly:
+
+   flows/replenishment_methods
+   flows/setup_stock_rule

purchase/replenishment/flows/replenishment_methods.rst

@@ -0,0 +1,4 @@
+=======================================================
+What are the available automated replenishment methods?
+=======================================================
+

purchase/replenishment/flows/setup_stock_rule.rst

@@ -0,0 +1,147 @@
+==================================
+How to setup a minimum stock rule?
+==================================
+
+For some items you hold in stock, it might be useful to have rules
+making sure you never run out of stocks (for example, products with a
+high demand, or large items requiring a lot of storage space meaning
+they're harder to stock).
+
+Odoo allows you to set up rules so that an automatic replenishment for
+those items is made, based on minimum stocks available.
+
+When should I use Reordering Rules?
+===================================
+
+Reordering Rules work best for items that have a high demand and high
+flow. It will relieve you from a lot of work to focus on the rest of
+your activities knowing that stocks will always be right.
+
+It can also be used when you have limited storage space and you need to
+keep large items in stock. In this case, you can keep as little as 1
+item in stock, and have a new one ordered as a stock replenishment as
+soon as the item in stock is sold.
+
+When should I avoid Reordering Rules?
+=====================================
+
+If you are offering a new product and don't know yet how fast it will
+go, you should handle stocks yourself first, and setup reordering rules
+only a few months into the sale to have better forecasts of the demand.
+
+If you sell items that have a limited lifetime, such as fashion items,
+technology items, or products working together with a system that is
+meant to evolve, you have to be very well informed on when to stop
+automated replenishments, in order to avoid having to sell these items
+at a price that will not allow you to break even.
+
+Example
+=======
+
+My company sells modern furniture. We sell a set of table and chairs
+that are available in 4 seatings and 6 seatings.
+
+To keep things simple, we stock tables and chairs separately, but sell
+them all together to our clients as a kit. In order to make sure we can
+always deliver a complete set of table and chairs, I setup a Reordering
+Rule for the chairs to make sure I always have at least 10 chairs in
+stock, but no more than 20. This way, I can sell up to 5 sets of table
+at once while keeping my stock low enough not to eat up all my storage
+space.
+
+The last table I sold was a 4 seatings, and there were 12 chairs left in
+my stock. Because the stock in chairs is now only 8 chairs, Odoo will
+automatically order 12 new chairs to fill up my stock to the maximum
+amount.
+
+Configuration
+=============
+
+Set up your product
+-------------------
+
+In the Purchases module, open the Purchase menu and click on Products.
+Open the product to which you would like to add a Reordering Rule (or
+create a new one).
+
+3 conditions for correct reordering rule :
+
+1. In :menuselection:`General information --> Product type`, make the product
+   stockable (as soon as this is done, the icon "Reordering rule will appear)
+2. In :menuselection:`Inventory --> route`, tick the "Buy" box (and untick the
+   Make To Order box)
+3. Select a vendor (don't forget to put a minimal quantity greater than 0)
+
+Create a reordering rule
+------------------------
+
+Click on the Reordering Rules tab, click on Create. A new page opens.
+
+.. image:: media/setup01.png
+  :align: center
+
+By default, Reordering Rules in Odoo are named as "OP/XXXXX" but you are
+free to use any nomenclature. You can modify it via the **Name** field.
+
+The **Product** field is the product you are creating the rule for.
+
+Select the warehouse to which the product should be delivered in the
+**Warehouse** field.
+
+If you have configured multiple warehouses and location, specify the
+location in which the product will be stored in the **Location** field.
+
+.. seealso::
+
+  :doc:`../../../warehouse/settings/warehouses/difference_warehouse_location`
+
+
+.. image:: media/setup02.png
+  :align: center
+
+In the **Minimum Quantity** field, insert the quantity to which the
+system will trigger a new order for replenishment.
+
+In the **Maximum Quantity** field, insert the maximum of items that has
+to be stocked. The replenishing order will be based on that quantity to
+reorder.
+
+The **Quantity Multiple** is the lowest number of items that can be
+ordered at once. For instance, some items may be only available for
+purchase in a set of 2.
+
+In the Misc section, the **Active** box allows you to activate or
+deactivate the rule.
+
+In the **Lead Time** section, you can enter:
+
+-  the number of Day(s) to purchase: correspond to the number of days
+   for the supplier to receive the order
+-  the number of Day(s) to get the products
+
+.. tip:: By default, the lead times are in calendar days. You can change that
+         in :menuselection:`Inventory --> Configuration --> Settings --> Minimum Stock Rules`
+
+When you have entered all the info, click on Save.
+
+From now on, every time a product with a reordering rule reaches the
+minimum stock, the system will automatically send a RfQ to your supplier
+based on your maximum quantity to replenish your stock.
+
+.. tip:: The replenishments will take place when the scheduler in the Inventory
+         module runs. By default in Odoo, the schedulers will run every night at
+         12:00PM.
+
+         To know how to configure and run the schedulers manually, read the
+         document on :doc:`../../../warehouse/management/miscellaneous/schedulers`
+
+.. seealso::
+  
+  :doc:`replenishment_methods`
+
+  :doc:`../../../warehouse/management/miscellaneous/schedulers`
+
+.. rst-class:: text-muted
+
+| Written by Samuel Cabodi (Odoo)
+| Proofread by Geoffrey Bressan (Odoo)

warehouse.rst

@@ -8,3 +8,5 @@ Warehouse
    :titlesonly:
 
    warehouse/overview
+   warehouse/settings
+   warehouse/management

warehouse/management.rst

@@ -0,0 +1,9 @@
+====================
+Warehouse Management
+====================
+
+.. toctree::
+   :titlesonly:
+   :glob:
+
+   management/miscellaneous

warehouse/management/miscellaneous.rst

@@ -0,0 +1,9 @@
+========================
+Miscellaneous Operations
+========================
+
+.. toctree::
+   :titlesonly:
+   :glob:
+
+   miscellaneous/schedulers

warehouse/management/miscellaneous/schedulers.rst

@@ -0,0 +1,3 @@
+====================================
+How to configure and run schedulers?
+====================================

warehouse/settings.rst

@@ -0,0 +1,9 @@
+========
+Settings
+========
+
+.. toctree::
+   :titlesonly:
+   :glob:
+
+   settings/*

warehouse/settings/warehouses.rst

@@ -0,0 +1,9 @@
+==========
+Warehouses
+==========
+
+.. toctree::
+   :titlesonly:
+   :glob:
+
+   warehouses/*

warehouse/settings/warehouses/difference_warehouse_location.rst

@@ -0,0 +1,3 @@
+========================================================
+What is the difference between warehouses and locations?
+========================================================