kaia agent kit guide added

[ayo-klaytn]

✨ Proposed Changes

kaia agent kit guide added

🗂️ Types of changes

• Minor Issues and Typos
• Major Content Contribution
• Others (e.g. platform-specific changes)

🔒 CLA requirements - FIRST-TIME CONTRIBUTORS only 📝

Welcome! Before we can review your PR, there's one important step:

1. Read our Contributor License Agreement.
2. Sign by commenting exactly this in the PR: I have read the CLA Document and I hereby sign the CLA

🔍 Why This Matters: This protects both you and the project, ensuring everyone can safely use your contributions. Without CLA signing, we can't merge your PR. Thank you for your understanding!

✅ Checklist

• I have read the CONTRIBUTING GUIDELINES.
• If following Standard Workflow: I have linked the approved issue below.
• If submitting without a prior issue (Maintainer/Regular): I have provided detailed context in the "Proposed Changes" section above.
• My changes render correctly (if applicable, run npm run build locally).
• I have added necessary documentation updates (if appropriate).
• Any dependent changes have been merged and published.

📌 Related issues

💡 Further comments

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