OFFICE-024: Update README with Office Support

[murdore]

Summary

Update main README.md to highlight office document support: feature list, quick examples, links to documentation. Update feature comparison table and installation instructions.

Technical Details

• File(s): README.md
• Effort: 1 hour

Acceptance Criteria

• [ ] Office document support added to feature list
• [ ] Quick example for DOCX processing
• [ ] Quick example for PPTX processing
• [ ] Quick example for XLSX processing
• [ ] Feature comparison table updated
• [ ] Supported file types section updated
• [ ] Links to office documentation added
• [ ] README renders correctly on GitHub

Dependencies

• Depends on: OFFICE-021
• Blocks: none

Priority: medium Effort: 1h Complexity: simple