Add CODE_OF_CONDUCT.md

[adamcohenhillel]

The repo has no CODE_OF_CONDUCT.md. GitHub's community-profile checklist flags this, and outside contributors read its absence as a signal.

Ask

Adopt the Contributor Covenant v2.1 (or similar). Place at CODE_OF_CONDUCT.md and reference it from .github/CONTRIBUTING.md and README.md.

Ideal good first issue.

Size: S

[Arun-kumar-e]

Hi! I'd like to work on this issue if it's still available.