[ADD] create project_funders to track funds on tasks

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

project_funders/models/__init__.py

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+from . import project_funders
+from . import project_task

project_funders/models/project_funders.py

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+from odoo import _, api, fields, models
+
+
+class ProjectFunders(models.Model):
+    _name = "project.funder"
+    _description = "Funder and amount for tasks"
+
+    name = fields.Char(compute="_compute_name", string="Name")
+    partner_id = fields.Many2one("res.partner", string="Funder", required=True)
+    amount = fields.Float("Untaxed Amount", required=True)
+    task_id = fields.Many2one("project.task", string="Task")
+
+    @api.depends("partner_id", "amount")
+    def _compute_name(self):
+        for record in self:
+            record.name = "%s (%s)" % (record.partner_id.name, record.amount)

project_funders/models/project_task.py

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+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"))