[MIG] Contract Payment Mode to 12.0

contract_payment_mode/readme/USAGE.rst

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+#. Go to *Accounting > Sales > Contracts*.
+#. Create one.
+#. Select a partner to which invoice.
+#. If the partner has a payment mode, this payment mode is selected here.
+#. If not, or if you want another payment mode, you can change it in the
+   corresponding field.
+#. Click on **Generate recurring invoices automatically** checkbox.
+#. Add a product to invoice.
+#. If you create an invoice, new invoice will have the selected payment mode.