docs: add README language selection links and Chinese docs link

[dowithless]

Added language selection links in README for easier access to translations: German, Spanish, French, Japanese, Korean, Portuguese, Russian, and Chinese.

Summary

Brief description of what this PR does and why.

Fixes #(issue)

Type of Change

• Bug fix
• New feature
• Breaking change
• Documentation
• Other: ___________

Testing

How has this been tested? What should reviewers focus on?

Checklist

• Code follows project style guidelines
• Self-reviewed my changes
• Tests added/updated and passing
• No new warnings introduced
• I confirm that I have read and agree to the terms outlined in the Contributor License Agreement (CLA)

Screenshots/Videos

[vercel]

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[greptile-apps]

Greptile Summary

This PR adds internationalization support to the project README by introducing language selection links for 8 different languages (German, Spanish, French, Japanese, Korean, Portuguese, Russian, and Chinese). The links are strategically positioned between the project badges and demo content, directing users to translated versions of the documentation via zdoc.app. This enhancement improves global accessibility for the Sim Studio AI platform, which is particularly valuable for an open-source agentic workflow platform that likely serves international users.

The implementation uses zdoc.app as an automated translation service that keeps translated versions synchronized with the main README, as indicated by the comment "Keep these links. Translations will automatically update with the README." This approach ensures maintenance efficiency while providing comprehensive language support. The change follows standard internationalization practices by placing language links prominently at the top of the documentation.

PR Description Notes:

• Several template sections remain incomplete (Summary, Testing, and Checklist items are not filled out)
• The issue reference format shows a placeholder "Fixes #(issue)" instead of an actual issue number

Confidence score: 5/5

• This PR is extremely safe to merge with no risk of production issues
• Score reflects that this is a purely documentation change with no functional code modifications
• No files require special attention as this is a simple README enhancement

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