Improve and update README with current API examples

[Jaben]

Summary

Comprehensive update to the README to reflect current v2.8.1+ API patterns and add documentation for features introduced in v2.6 through v2.8.1.

Changes Made

New Examples Added

• Cookie Support (v2.8.1) - Demonstrates adding cookies to Chromium cookie jar for authenticated requests
• SinglePage Property (v2.8.1) - Shows how to generate single-page PDFs from multi-page content
• Document Metadata (v2.6) - Example of adding custom metadata (Author, Title, Subject, Keywords) to PDFs
• PDF Format Conversion - Converting PDFs to PDF/A formats using LibrePdfFormats

New Sections

• Required Using Statements - Lists all necessary namespace imports for easier project setup
• Advanced Features - Comprehensive section covering:
  • PDF/UA support for both HTML and PDF conversions (v2.4+)
  • Flatten PDFs (v2.8+)
  • Skip Network Idle Event for faster conversions (Gotenberg v8+)
  • Custom Page Properties reference with all available options

Improvements

• Updated Office merge example to include PDF format setting
• Fixed enum references (PdfFormats → LibrePdfFormats)
• Added version tags to examples (e.g., "v2.8.1+", "v2.6+") for clarity
• All examples now use current API patterns

Test plan

• Reviewed all code examples for accuracy against current implementation
• Verified enum names and method signatures match source code
• Confirmed all new features exist in codebase (Cookie, SinglePage, Metadata, etc.)
• Checked version tags against CHANGES.MD

🤖 Generated with Claude Code

[cursor]

You have run out of free Bugbot PR reviews for this billing cycle. This will reset on November 7.

To receive reviews on all of your PRs, visit the Cursor dashboard to activate Pro and start your 14-day free trial.

[coderabbitai]

Important

Review skipped

Auto reviews are disabled on base/target branches other than the default branch.

Please check the settings in the CodeRabbit UI or the .coderabbit.yaml file in this repository. To trigger a single review, invoke the @coderabbitai review command.

You can disable this status message by setting the reviews.review_status to false in the CodeRabbit configuration file.

✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch feature/readme-improvement

---

Thanks for using CodeRabbit! It's free for OSS, and your support helps us grow. If you like it, consider giving us a shout-out.

❤️ Share

• X
• Mastodon
• Reddit
• LinkedIn

_{Comment @coderabbitai help to get the list of available commands and usage tips.}