[IMP] documentation about odoo.conf

Close #9

odoo_openupgrade_wizard/templates/odoo/odoo.conf.j2

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+# This file can be left empty
+# The following standard parameters are generated automatically and are
+# not required to be found in this file:
+# - addons_path
+# - connection parameters to the database
+# - database name
+# - http or xml port
+# - etc.
+# Only non standard or special options should be specified here.