Add Awesome AI Startups to Curated Resource Lists

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Adds one entry to the Curated Resource Lists subsection (under §14 Resources & Learning):

• Awesome AI Startups — A curated list of bootstrapped, pre-seed, and angel-funded AI products built by independent founders. Organized by category (marketing, coding, content, design, productivity, and more) for discovering indie AI tools. CC0-1.0 licensed.

Checklist

• Format matches existing entries in the section (bold title, GitHub stars badge, description, license note)
• License: CC0-1.0 (OSI-recognized public-domain dedication)
• Actively maintained
• High-quality, well-documented curated list