docs: add tools.cafe badge to README

[Tranthanh98]

Add the tools.cafe featured badge below the README navigation links, preserving the existing content.

Summary by CodeRabbit

• Documentation
  • Added a centered tools.cafe badge linking to the tools.cafe website.

[coderabbitai]

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No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Repository UI

Review profile: CHILL

Plan: Advanced

Run ID: db53011a-c566-4e61-a51a-5866e7f45761

📥 Commits

Reviewing files that changed from the base of the PR and between 6bad309 and d0365ff.

📒 Files selected for processing (1)

• README.md

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📝 Walkthrough

Walkthrough

The README adds a centered tools.cafe badge that links to the site in a new tab with rel="noopener".

Changes

README badge

Layer / File(s)	Summary
Add the tools.cafe badge README.md	The README adds a centered badge that links to tools.cafe in a new tab with rel="noopener".

Priority: ⬇️ Low

Estimated code review effort: 1 (Trivial) | ~3 minutes

Change: Other

Merge Risk: ⚪ Minimal · up to d0365

The README badge change presents no identified merge-blocking risk.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the README documentation change: adding a tools.cafe badge.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…
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)

• Commit to this branch
• Create a new PR

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