[11.0][UPD] mrp_multi_level: update README and manifest to OCA standards.

mrp_multi_level/readme/CONFIGURE.rst

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+* Go to *Manufacturing > MRP > MRP Area* and define or edit any existing area.
+  You can specify the working hours for every area.

mrp_multi_level/readme/CONTRIBUTORS.rst

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+* Wim Audenaert <wim.audenaert@ucamco.com>
+* Jordi Ballester <jordi.ballester@eficent.com>
+* Lois Rilo <lois.rilo@eficent.com>

mrp_multi_level/readme/DESCRIPTION.rst

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+This module allows you to calculate, based in known inventory, demand, and
+supply, and based on parameters set at product variant level, the new
+procurements for each product.
+
+To do this, the calculation starts at top level of the bill of material
+and explodes this down to the lowest level.
+
+Key Features
+------------
+
+* MRP parameters at product variant level.
+* Integration with `Stock Demand Estimates <https://github.com/OCA/stock-logistics-warehouse/tree/11.0/stock_demand_estimate>`_ system.
+* Cron job to calculate the MRP demand.
+* Manually calculate the MRP demand.
+* Confirm the calculated MRP demand and create PO's, or MO's.
+* Able to see the products for which action is needed.

mrp_multi_level/readme/USAGE.rst

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+To manually run the MRP scheduler:
+
+#. Go to *Manufacturing > MRP > Run MRP Multi Level*.
+#. On the wizard click *Run MRP*.
+
+To launch replenishment orders (moves, purchases, production orders...):
+
+#. Go to *Manufacturing > MRP > MRP Inventory*.
+#. Filter with *To procure*.
+#. Select multiple records and click on *Action > Procure* or click the right
+   hand side gears in any record.
+#. On the wizard, check everything is ok and click *Execute*.