docs:Adding agent v3 docs

[nginx-seanmoloney]

Proposed changes

• Initial commit of v3 docs.

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Problem: Give a brief overview of the problem or feature being addressed.

Solution: Explain the approach you took to implement the solution, highlighting any significant design decisions or
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• I have read the contributing guidelines
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• If the change involves potentially sensitive changes¹, I have assessed the possible impact
• If applicable, I have added tests that prove my fix is effective or that my feature works
• I have ensured that existing tests pass after adding my changes
• If applicable, I have updated README.md and CHANGELOG.md

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[github-actions]

✅ All required contributors have signed the F5 CLA for this PR. Thank you!
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[nginx-seanmoloney]

I have hereby read the F5 CLA and agree to its terms

[github-actions]

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