Add MCP Toplist rank badge

[chrstphe]

Hi! MCP Toplist tracks 81,919 MCP servers across the major
registries, and Caplets is currently ranked #870.

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 Caplets!

Summary by CodeRabbit

• Documentation
  • Added an MCP Toplist badge at the top of the README.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro Plus

Run ID: 02739afd-5189-4920-bf8a-3f369aaf715d

📥 Commits

Reviewing files that changed from the base of the PR and between 7a69a63 and 45ee5d8.

📒 Files selected for processing (1)

• README.md

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📝 Walkthrough

Walkthrough

The README now includes an MCP Toplist badge and link as its first content, with no other content changes.

Changes

README badge update

Layer / File(s)	Summary
Add MCP Toplist badge README.md	Adds the MCP Toplist badge and link at the beginning of the README.

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

Suggested reviewers: ian-pascoe

Poem

A bunny hops where badges gleam,
An MCP link joins the stream.
The README starts with a cheerful sign,
Two fresh lines tucked neatly in line.

🚥 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 accurately summarizes 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.