Add resources section to README to include ai-declare skill

[yujqiao]

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Related Issue:
This is a simple and straight-forward change without an issue. Feel free to close this if you think it's not the right place to include

Description of Changes:

Add resources section to README to include ai-declare skill

AI-DECLARATION.md:

• I have reviewed the project's AI-DECLARATION.md
• I have updated AI-DECLARATION.md to reflect AI usage in this contribution (or confirmed no update is needed)

Additional Notes:
Feel free to close this if you think it's not the right place to include

[DeepanshKhurana]

@yujqiao, thank you for the skill. I believe it will help people a lot and make things easier for them! I invite new tooling so this is welcome! That said, I have a few nitpicks.

Isn't it a huge overhead to keep updating the skill with the right version instead of it somehow fetching or inferring the latest version from the spec? Again, I don't mind but I think you will have to update it each time the spec updates and it would be a chore for you. Up to you on this one. (source)

## Common Mistakes

- **Wrong version string**: Must be `"0.1.2"` (quoted, with patch version)

Also, although verbose, I would suggest that the options a user gets remain the same as the spec's usage definitions (and be updated accordingly) if future specs change things. These are discussed and deliberated over on GitHub, Reddit, and other places, and the phrasing is a feature in a way. Also, I know the spec will be written correctly, but then this defeats a sort of assumed WYSIWYG for the user of the skill. (source).

> Which AI involvement level best describes this project?
> 1. **none** — No AI tools used
> 2. **hint** — AI surfaced suggestions passively
> 3. **assist** — AI helped with parts of tasks
> 4. **pair** — Human and AI collaborated equally
> 5. **copilot** — AI generated most code with human oversight
> 6. **auto** — AI built the project autonomously

[DeepanshKhurana]

This is a great idea, and I thank you for the initiative. Let's discuss on my other comments. I'm curious to hear what you think!

[DeepanshKhurana]

I recommend changing this to:

- [yujqiao/ai-declare](https://github.com/yujqiao/ai-declare) agent skill to generate `AI-DECLARATION.md`

[DeepanshKhurana]

💡 If the spec exposed an API that was a simple, no auth, REST GET endpoint that simply gave the current schema of the spec, would a skill be able to consume it?