[ADD] reporting-context

report_context/readme/CONTRIBUTORS.rst

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+* Jaime Arroyo <jaime.arroyo@creublanca.es>

report_context/readme/DESCRIPTION.rst

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+This module adds a context variable to reports. A possible use for this
+context could be hiding some fields or many other configuration options.

report_context/readme/USAGE.rst

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+To configure this module, you need to:
+
+* Enter Odoo in debug mode.
+* To add a specific context to a report, you should go to Settings ->
+  Reporting -> Reporting and look for the report you want to edit on the
+  list. You will see that now they contain a new field called Context Value
+  , where you will be able to add all the desired context parameters.
+* Go to Settings -> Parameters -> System Parameters. On the system
+  parameters list, look for report.default.context, which is a Python
+  dictionary variable where you can add a context that will be common for
+  all reports.
+
+It can also be added on the developer side using::
+
+    <record id="model_name.report_id" model="ir.actions.report">
+        <field name="context">YOUR CONTEXT HERE</field>
+    </record>
+