[ADD] helpdesk_portal_ticket_custom: add priority to portal ticket list

helpdesk_portal_ticket_custom/README.md

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+====================================
+helpdesk_portal_ticket_custom
+====================================
+
+Customization for ticket portal view.
+
+# Installation
+
+Use Odoo normal module installation procedure to install
+`helpdesk_portal_ticket_custom`.
+
+# Known issues / Roadmap
+
+None yet.
+
+# Bug Tracker
+
+Bugs are tracked on `our issues website <https://github.com/elabore-coop/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
+
+- Joris Scampucci
+
+## Funders
+
+The development of this module has been financially supported by:
+
+- Elabore (https://elabore.coop)
+
+## Maintainer
+
+This module is maintained by Elabore.