Add MCP Toplist rank badge

[chrstphe]

Hi! MCP Toplist tracks 81,919 MCP servers across the major
registries, and Plane MCP Server is currently ranked #746.

This PR adds a small live badge to your README showing that rank — it updates
automatically as the leaderboard changes:

Totally fine to close if you'd rather not — and if you'd like your server's
data corrected or removed from the leaderboard, just say so here or open an
issue at the site. Thanks for building Plane MCP Server!

Summary by CodeRabbit

• Documentation
  • Added an MCP Toplist badge link under the “Plane MCP Server” section.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: b55e4a2e-fc92-4ebb-bc5a-4335ece2cce3

📥 Commits

Reviewing files that changed from the base of the PR and between 96cf4d5 and 4095af0.

📒 Files selected for processing (1)

• README.md

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📝 Walkthrough

Walkthrough

Changes

MCP Toplist Badge

Layer / File(s)	Summary
README badge placement README.md	Adds an MCP Toplist badge image and link immediately below the “Plane MCP Server” heading.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Suggested reviewers: akhil-vamshi-konam

🚥 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 main change: adding an MCP Toplist rank badge 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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Warning

⚠️ This pull request has been flagged as potential spam (promotional) by CodeRabbit slop detection and should be reviewed carefully.