[ADD] create project_funders to track funds on tasks

Signed-off-by: Valentin Lab <valentin.lab@kalysto.org>

project_funders/models/project_task.py

@@ -0,0 +1,13 @@
+from odoo import _, api, fields, models
+
+
+class ProjectTask(models.Model):
+    _inherit = "project.task"
+
+    funder_ids = fields.One2many("project.funder", "task_id", string="funder")
+    amount_total = fields.Float(compute="_compute_amount_total", string="Amount Total")
+
+    @api.depends("funder_ids")
+    def _compute_amount_total(self):
+        for record in self:
+            record.amount_total = sum(record.funder_ids.mapped("amount"))