Add Contributor Covenant Code of Conduct

[volpatto]

Added Contributor Covenant Code of Conduct to outline community standards and enforcement.

[github-actions]

Coverage

• Overall line coverage on Ubuntu: 99.87%
• Diff coverage: n/a%
• Required diff coverage: 99%
• Result: ✅ passed

diff-cover output

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Diff Coverage
Diff: origin/main...HEAD, staged and unstaged changes
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No lines with coverage information in this diff.
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[Copilot]

Pull request overview

This PR adds a CODE_OF_CONDUCT.md file based on the Contributor Covenant v2.0 template to establish community standards and enforcement procedures for the project.

Changes:

• Adds a full Contributor Covenant Code of Conduct (v2.0) covering community pledge, standards, enforcement responsibilities, scope, enforcement guidelines, and attribution.

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