Add a guide for using Gradio skills

[yvrjsharma]

Description

This adds a new guide documenting the gradio skills add CLI command

AI Disclosure

We encourage the use of AI tooling in creating PRs, but the any non-trivial use of AI needs be disclosed. E.g. if you used Claude to write a first draft, you should mention that. Trivial tab-completion doesn't need to be disclosed. You should self-review all PRs, especially if they were generated with AI.

• I used AI to generate some of the guide's content.
• I did not use AI

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[yvrjsharma]

Location: guides/11_other-tutorials/Gradio-skills-for-ai-coding-assistants.md

[gradio-pr-bot]

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[gradio-pr-bot]

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