Add readme

Author: matthieu.saison

account_journal_display_type/models/readme/CONTRIBUTOR.rst

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+* Matthieu Saison <matthieu.saison@akretion.com>

account_journal_display_type/models/readme/DESCSRIPTION.rst

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+This module introduce improvement on journal type to simplify configuration of Payment and Cash Journal.
+
+
+The payment journal does not exist in odoo, it's associate to a bank journal but in payment case, 
+the default_account_id will have the same value as payment_debit_account_id.
+This module introduce a new field type called display_type who hide the default type from UI, and make possible to had new journal type. Payment display_type is hadded here, and the associated legacy journal type is bank. The default_account_id is hided and will have the same value as payment_debit_account_id
+
+For Cash type, the only field we kept is default_account_id. The payment config tab is useless for a cash journal and was remove from UI. (in this case payment_debit_account_id and payment_credit_account_id are set with value of default_account_id)

account_journal_display_type/views/account_journal_view.xml

@@ -10,7 +10,7 @@
                 <attribute name="attrs">{'invisible': True}</attribute>
                 </field>
                 <field name="type" position="after">
-                    <field name="display_type" />
+                    <field name="display_type" string="Sequence"/>
                 </field>
 
                 <xpath