Add ReadmeGenAI to Documentation Generation (closes #205)

[Patel230]

Description

Adds ReadmeGenAI — AI-powered README generator for GitHub — to the Documentation Generation section.

• Paste a repo URL → instant professional README.md
• 105 stars, TypeScript, actively maintained
• Fills a real gap (no AI README generator currently listed)

Checklist

• The entry is a tool that uses AI
• The entry is a developer-focused tool
• The description is unambiguous and clear
• The description matches the style of other entries

[github-actions]

👋 Hi @Patel230,
Thank you for your contribution! However, this PR doesn't follow our PR template requirements.
Issues found:

• Missing required section: ## Description
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2. Make sure to fill out the Description section
3. Check all applicable items in the Checklist
   This PR will be closed automatically. Once you've updated your PR description, feel free to reopen it or create a new PR.

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