docs: add code of conduct

[ajbozarth]

Misc PR

Type of PR

• Bug Fix
• New Feature
• Documentation
• Other

Description

• Link to Issue: Contribution guidelines are not provided in README. #315

Adds a standard code of conduct policy similar to other open source projects.

The initial doc points to the org members list for private reporting, but this should be updated to either a MAINTAINERS.md or a committers list once we've added one of them

Testing

• Tests added to the respective file if code was changed
• New code has 100% coverage if code as added
• Ensure existing tests and github automation passes (a maintainer will kick off the github automation when the rest of the PR is populated)

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🟢 Enforce conventional commit

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Make sure that we follow https://www.conventionalcommits.org/en/v1.0.0/

• title ~= ^(fix|feat|docs|style|refactor|perf|test|build|ci|chore|revert|release)(?:\(.+\))?:

[planetf1]

Agree with this proposal - it's a very standard, widely used text (with the well respected mozilla clarifications)