[ADD] helpdesk_ticket_deadline: add a manual deadline on tickets

This module adds a simple, manually filled ``date_deadline``
Date field, tracked in the chatter, with an overdue flag,
a red kanban decoration and search filters (overdue, due
today, group by deadline).

helpdesk_ticket_deadline/README.rst

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+========================
+helpdesk_ticket_deadline
+========================
+
+Add a manually filled deadline date on helpdesk tickets.
+
+This module extends the ``helpdesk_mgmt`` module by adding a "Deadline"
+concept to tickets. It provides:
+
+* A ``date_deadline`` Date field on helpdesk tickets, tracked in the chatter.
+* Backend views integration:
+
+  * Form view: deadline displayed right after the priority field.
+  * Kanban view: deadline displayed on the card through the ``remaining_days``
+    widget, which turns it red once the deadline is past.
+  * List view: optional deadline column after the assigned user.
+  * Search view: filter by deadline, "Overdue" and "Due Today" filters, and a
+    "Deadline" grouping.
+
+The field is intentionally **manual**: it is not computed from priorities,
+teams or calendars.
+
+Installation
+============
+
+Use Odoo normal module installation procedure to install
+``helpdesk_ticket_deadline``.
+
+This module depends on ``helpdesk_mgmt`` which must be available.
+
+Known issues / Roadmap
+======================
+
+* No scheduled reminder is created when a deadline is reached; only the
+  chatter tracking and the kanban/list overdue indicator exist. A reminder
+  could be added in a later version.
+
+Bug Tracker
+===========
+
+Bugs are tracked on `our issues website <https://git.elabore.coop/Elabore/helpdesk-tools/issues>`_. In case of
+trouble, please check there if your issue has already been
+reported. If you spotted it first, help us smashing it by providing a
+detailed and welcomed feedback.
+
+Credits
+=======
+
+Contributors
+------------
+
+* Quentin Mondot - `Email <mailto:quentin.mondot@elabore.coop>`_
+
+Funders
+-------
+
+The development of this module has been financially supported by:
+* Elabore (https://elabore.coop)
+
+
+Maintainer
+----------
+
+This module is maintained by Elabore.