[ADD] inventory: new doc about configuring and run schedulers

[ADD] inventory: new doc about configuring and run schedulers

inventory/management/planning.rst

@@ -7,3 +7,4 @@ Planning
    :glob:
 
    planning/scheduled_date
+   planning/schedulers

inventory/management/planning/schedulers.rst

@@ -0,0 +1,58 @@
+============================
+Configure and Run Schedulers
+============================
+
+What is a scheduler?
+====================
+
+The scheduler is the calculation engine that plans and prioritizes
+production and purchasing. It does it automatically, according to the
+rules defined on products. By default, the scheduler is set to run once
+a day.
+
+Calculating Requirements / Scheduling
+=====================================
+
+Scheduling only validates procurements that are confirmed but not yet
+started. These procurement reservations will start production, tasks or
+purchases themselves, depending on the configuration of the requested
+product.
+
+As a human would do, the scheduler takes the priority of operations into
+account when starting reservations and procurements. Urgent requests
+will be started first.
+
+.. note::
+		In case there are not enough products in stock to satisfy all the
+		requests, you can be sure that the most urgent ones will be produced
+		first.
+
+Configure and run the scheduler
+===============================
+
+Run the scheduler manually
+--------------------------
+
+To start the scheduler manually, go to *Inventory > Operations > Run
+Schedulers*. The scheduler uses all the relevant parameters defined for
+products, suppliers and the company to prioritize the different
+production orders, deliveries and supplier purchases.
+
+.. image:: media/schedulers_01.png
+    :align: center
+
+Configure and run the scheduler (for advanced users)
+----------------------------------------------------
+
+To use this feature, you have to enable the debug mode. To do so, go to
+*Settings > Activate the developer mode*.
+
+.. image:: media/schedulers_02.png
+    :align: center
+
+Then, go to *Settings > Technical > Automation > Scheduled Actions*
+and modify the *Run MRP Scheduler Configuration*. There, you can set
+the starting time of the scheduler.
+
+.. image:: media/schedulers_03.png
+    :align: center