docs: add rspress-plugin-pdf-generator to README

[MaxtuneLee]

What

rspress-plugin-pdf-generator is an Rspress plugin designed to automatically render and compile documentation pages into PDF files during the site build process.

repo: https://github.com/MaxtuneLee/rspress-plugin-pdf-generator

Files touched

Add rspress-plugin-pdf-generator to README.

[coderabbitai]

📝 Walkthrough

Walkthrough

Added rspress-plugin-pdf-generator to the README’s “Rspress Plugins” list, describing its support for generating multilingual single-page or multi-page PDFs during the Rspress build process.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately summarizes the README update adding rspress-plugin-pdf-generator.
Description check	✅ Passed	The description matches the changeset by saying the plugin was added to the README.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[coderabbitai]

Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@README.md`:
- Line 362: Update the rspress-plugin-pdf-generator README description to
clearly state that it generates either one merged PDF or one PDF per Rspress
page, while preserving the supported multilingual output.

🪄 Autofix (Beta)

Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 9c46df3a-384d-4e1d-9c4d-6f320a08ac99

📥 Commits

Reviewing files that changed from the base of the PR and between 34a5ad4 and 9687c7f.

📒 Files selected for processing (1)

• README.md

[chenjiahan]

Thank you!