Add comprehensive CLOWarden permissions documentation

[Aaravanand00]

• Add CLOWARDEN_PERMISSIONS.md: Complete system overview and configuration guide
• Add CONTRIBUTING_PERMISSIONS.md: Step-by-step contributor guide
• Add docs/PERMISSIONS_QUICK_REFERENCE.md: Syntax reference and common patterns
• Add docs/CLOWARDEN_WORKFLOW.md: Detailed workflow from request to implementation
• Add docs/PERMISSIONS_CHECKLIST.md: Validation and quality assurance checklists
• Add docs/INDEX.md: Complete documentation navigation and index
• Add ISSUE_230_SUMMARY.md: Resolution summary for GitHub Issue Need docs on how CLOWarden defines project permissions #230
• Update README.md: Add links to new CLOWarden documentation

This addresses Issue #230 by providing the missing documentation for CLOWarden's permission management system, including permission levels, configuration structure, security guidelines, and complete workflows.

Total documentation: ~71KB across 7 files covering all aspects of CLOWarden repository permission management for CNCF organization.

Fixes #230