Code of conduct #5708

Related to #5676 and #5675 I would like to discuss creating a contributor code of conduct.
At LatinR last week, I spoke with @paocorrales who told me that it is important to name people to contact for reporting violations.

Related software:

• Apache: https://www.apache.org/foundation/policies/conduct.html does mention contacts (five individual emails), but does not specifically mention consequences for violators.
• Tidyverse: https://tidyverse.tidyverse.org/CODE_OF_CONDUCT.html does not mention contacts, but does mention consequences: "Project maintainers who do not follow the Code of Conduct may be removed from the project team."
• Pandas: https://pandas.pydata.org/community/coc.html does mention an email list [email protected] to contact for violations, and also mention consequences: "Project maintainers have the right and responsibility to ... ban temporarily or permanently any contributor for other behaviors that they deem inappropriate, threatening, offensive, or harmful."

Related R confs

• Standard RFCC: https://www.r-project.org/coc.html
• LatinR: https://latin-r.com/en/sobre/coc/code-of-conduct.html