Add code of conduct docs

[korikuzma]

Feature description

Add CODE_OF_CONDUCT.md to define GML community standards.

https://docs.github.com/en/communities/setting-up-your-project-for-healthy-contributions/adding-a-code-of-conduct-to-your-project###

Use case

• As a member of the GML community, I would like clear guidelines on how to interact respectfully/inclusively so that everyone feels welcome/safe when contributing to or using GML projects

Acceptance Criteria

Given a stakeholder is interacting within the GML community
When they read the CODE_OF_CONDUCT.md doc
Then they should understand the standards of behavior

Proposed solution

No response

Alternatives considered

No response

Implementation details

No response

Potential Impact

No response

Additional context

I can create the initial PR, but would like feedback from @GenomicMedLab/wagner-lab

Contribution

Yes, I can create a PR for this feature.