[ADD] estate_account: Chapter 14-link module estate and accounting

Override the sold action of the estate module to create an invoice
when a property is sold.
The invoice is a 6% down payement with a 100€ admin fees.

estate_account/__init__.py

@@ -0,0 +1 @@
+from . import models

estate_account/__manifest__.py

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+# Part of Odoo. See LICENSE file for full copyright and licensing details.
+
+{
+    'name': "estate_account",
+    'version': '1.0',
+    'depends': ['estate', 'account'],
+    'author': "Clément Cardot (cacl)",
+    'license': "LGPL-3",
+    'description': """
+        A link module to create invoices from property sales
+    """,
+
+    'data': [
+
+    ],
+
+    'application': False,
+}

estate_account/models/__init__.py

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+# Part of Odoo. See LICENSE file for full copyright and licensing details.
+
+from . import estate_property

estate_account/models/estate_property.py

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+# Part of Odoo. See LICENSE file for full copyright and licensing details.
+
+from odoo import models, Command
+
+class EstateProperty(models.Model):
+    _inherit = "estate.property"
+
+    def action_sold(self):
+        values = {
+            'move_type': 'out_invoice',
+            'partner_id': self.buyer_id.id,
+            #'journal_id': self.env['account.journal'].search([('type', '=', 'sale')], limit=1).id
+            'invoice_line_ids': [
+                Command.create({
+                    'name': self.name + ' - 6% down payment',
+                    'quantity': 1,
+                    'price_unit': self.selling_price * 0.06,
+                }),
+                Command.create({
+                    'name': 'administrative fees',
+                    'quantity': 1,
+                    'price_unit': 100.00,
+                }),
+            ]
+        }
+        self.env['account.move'].create(values)
+        return super().action_sold()