Need clear documentation for community contributions, including process and expectations for pull requests

[jamescummings]

At Guelph F2F 2023-05-07 it is suggested that we need clear documentation for community contributions, including the overall process and expectations for pull requests.

[jamescummings]

Discussion about this at Council meeting suggests that putting this contributor information in a .github repository along with other templates for contributing pull requests, overall default information like licenses, etc c.f. https://www.freecodecamp.org/news/how-to-use-the-dot-github-repository/