Add CODE_OF_CONDUCT.md

[askmy-stack]

Background

Identified during OSS audit v2 of startupintel.

Problem Statement

Missing CoC.

Proposed Solution

Contributor Covenant.

Acceptance Criteria

• Implementation complete
• Tests pass
• Documented in README or docs/

Files / Modules Affected

CODE_OF_CONDUCT.md

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Suggested labels: priority:high, good first issue, category:documentation
Milestone: v1.0-oss-ready
OSS Audit: Master Backlog v2

[kristin223lab]

Hi! I would love to work on this issue and add the CODE_OF_CONDUCT.md using the Contributor Covenant template. Could you please assign this to me? Thanks!