docs: add contributing guide with issue policy

[R-Lawton]

• adds CONTRIBUTING.md with issue policy requiring assignment before starting work
• links to the centralised Kuadrant contributing guide for PR and triage rules
• includes repo-specific contribution guidelines (bug reports, PRs, testing, linting)

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📥 Commits

Reviewing files that changed from the base of the PR and between c2dfc6a and b0f20b1.

📒 Files selected for processing (1)

• CONTRIBUTING.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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