Create CODE_OF_CONDUCT.md

[munkim]

Description

Adding code of conduct as part of community standards.

Type of change

• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] Chore items (this includes basic clean up of files, or updates to packages)
• [x] Updates to documentation

Checklist

• [x] I have a descriptive title for my PR
• [x] I have linked the issue to this PR (Note)
• [x] I have run the project locally and reviewed the code changes
• [x] My changes generate no new warnings