📄 Optimize README: Add badges, TOC, and structure

[Gingiris]

Hi! I noticed this repo has a very sparse README and wanted to help improve it.

What I improved:

• ✅ Added badges (Python version, License, Stars, Last Commit)
• ✅ Added Table of Contents for easy navigation
• ✅ Added Features table summarizing the content categories
• ✅ Added Quick Start section with code examples
• ✅ Added Category Index (AWS, Azure, GCP, AI/ML, Interview Prep)
• ✅ Added Contributing section

Before vs After

Metric	Before	After
Size	275 chars	~2,500 chars
Badges	0	4
TOC	❌	✅
Features table	❌	✅

The improvements are purely cosmetic — no code changes were made.

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README optimized with Gingiris README Generator