Agree on and implement more complete GitHub project setup

[Erik0x42]

As of the writing of this issue, this project shows 2 out of 9 green checkmarks on the iec63131 project compared to community standards page (screenshot below).
While that is one measure of completeness, it does not cover all aspects of a complete GitHub project setup.

The following tasks are proposed to close this issue (subject to discussion, revision and agreement)

1. leverage GitHub teams to control permissions in a role-based way, and give higher privileges to more stakeholder nominated contributors (counter the increased privileges with stricter PR policies, see item 3)
2. create pull request and issue templates
3. set stricter rules for pull requests to main (merge restrictions, mandatory issue links, minimum and/or specific reviewers)
4. write best practices (in README) for; commit message wording, pull request title and description, issue closure checklists

How this project compares with community standards as of 2023-09-25: