[ADD] base_global_discount: New Module 11.0

base_global_discount/readme/CONFIGURE.rst

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+To use this module, you need to:
+
+#. Go to *Settings > Parameters > Global Discounts*
+#. Choose the discount scope (sales or purchases).
+#. You can also restrict it to a certain company if needed.

base_global_discount/readme/CONTRIBUTORS.rst

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+* `Tecnativa <https://www.tecnativa.com>`_
+
+  * Pedro M. Baeza
+  * David Vidal
+  * Carlos Dauden
+  * Rafael Blasco

base_global_discount/readme/DESCRIPTION.rst

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+Base module to have global discounts applied to either sales or purchases. It
+doesn't do much for itself, so account_global_discount or
+purchase_global_discount should be installed to benefit from it.

base_global_discount/readme/USAGE.rst

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+You can assign global discounts to partners as well:
+
+#. Go to a partner that is a company.
+#. Go to the *Sales & Purchases* tab.
+#. In section sale (if the partner is a customer), you can set sale discounts.
+#. In section purchase (if the partner is a supplier), you can set purchase
+   discounts.