Add purchase buyer module

purchase_order_buyer/README.rst

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+.. image:: https://img.shields.io/badge/licence-AGPL--3-blue.svg
+   :target: http://www.gnu.org/licenses/agpl-3.0-standalone.html
+   :alt: License: AGPL-3
+
+====================
+Purchase Order Buyer
+====================
+
+Adds a buyer on the Purchase Order. (Like a vendor on sales).
+
+A prefered buyer can be set on the supplier.
+
+Usage
+=====
+
+To use this module, you need to go to Purchase > Purchase Order: there a new field "Buyer"
+It will use buy default the user_id of the supplier and fallback to current user.
+
+Credits
+=======
+
+
+Contributors
+------------
+
+* Raphaël Reverdy <raphael.reverdy@akretion.com>
+
+Maintainer
+----------
+
+Akretion