añadido sal global discount desde OCA/sale-workflow

sale_global_discount/readme/CONFIGURE.rst

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

sale_global_discount/readme/CONTRIBUTORS.rst

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

sale_global_discount/readme/DESCRIPTION.rst

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+Apply global financial discounts to sales that will be transmited to invoices
+and accounting.

sale_global_discount/readme/ROADMAP.rst

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+* Not all the taxes combination can be compatible with global discounts. An
+  error is raised in that cases.
+* Currently, taxes in invoice lines are mandatory with global discounts.

sale_global_discount/readme/USAGE.rst

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+To use this module, you need to:
+
+#. Create a new sale order and choose a partner.
+#. If the partner has customer global discounts set, those will be applied to
+   the order by default.
+#. Otherwise, you can set them manually from the header of the sale order.
+#. In the order footer, you can see the computed discounts.
+#. When you create an invoice from the order, the proper global discounts will
+   be applied on it.