Add MCP Toplist rank badge

[chrstphe]

Hi! MCP Toplist tracks 81,852 MCP servers across the major
registries, and podcli is currently ranked #713.

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 podcli!

Summary by CodeRabbit

• Documentation
  • Added an MCP Toplist badge to the README with a link to the project’s server listing.

[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: bc2dfc63-ceca-4949-ae9e-33bf4faed599

📥 Commits

Reviewing files that changed from the base of the PR and between 4e7cbaa and b97a2bd.

📒 Files selected for processing (1)

• README.md

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📝 Walkthrough

Walkthrough

Changes

MCP Toplist Badge

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

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

Suggested reviewers: nmbrthirteen

🚥 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.