Reimagined the README to better showcase the extension's value and improve discoverability for new users.

Key Changes

• Visual hierarchy: Added centered hero section with badges, emojis for section markers, and clear separators
• Value proposition: New "Why Use This Extension?" section with before/after code comparison demonstrating time savings
• Feature showcase: Highlighted 20+ snippets with bullet points emphasizing speed, smart cursor positioning, and framework support
• Enhanced documentation: Restructured snippet tables with three columns (Prefix | Description | Output) instead of two, added category explanations
• Installation clarity: Split into marketplace and manual installation methods with numbered steps
• Usage examples: Added concrete examples showing snippet output for ptnew, ptfor, and ptd-stat
• Community engagement: Expanded contributing guidelines and support options with actionable links

Before/After

Before: Basic table format

Prefix | Output
-------|-------
ptfor | Adds a `for` loop block

After: Descriptive three-column format

| Prefix | Description | Output |
|--------|-------------|---------|
| `ptfor` | For loop | `{% for item in items %}...{% endfor %}` |

Increased from 78 to 220 lines with improved information density and scannability.

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