docs(readme): add ClawHub download history chart

[gavinlinasd]

Hey! 👋

I'm Gavin — I built skill-history.com, a free tool that tracks ClawHub skill download history over time (think star-history.com but for agent skills).

I noticed your skill Evolver has been getting solid traction — 73012 downloads so far — so I set up a chart page for it:

👉 https://skill-history.com/autogame-17/evolver

This PR adds a small download history section to the bottom of your README with a live-updating chart that refreshes daily. Here's what it looks like:

No setup, no tokens, no CI changes — just an SVG embed that auto-updates.

If you'd prefer a compact badge instead of the full chart, you can swap it for this:

![Downloads](https://skill-history.com/badge/autogame-17/evolver.svg)

The whole thing is open source: github.com/pineapple-farm/skill-history

It's a brand new project and I'm shaping it based on what skill authors actually want. If you have any feedback, feature requests, or ideas:

• Open an issue
• Submit a PR
• Or just drop a comment here

Totally understand if this isn't your thing — feel free to close. But if it's useful, I'm excited to see it on your README!

If you find this project useful, a ⭐ on the repo would mean a lot — it helps other skill authors discover it.

Cheers,
Gavin
Pineapple AI

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Note

Low Risk
Documentation-only README change; external SVG embed is comparable to the existing star-history chart.

Overview
Adds a Download History section at the end of README.md, after the license block, with a linked embed to skill-history.com for ClawHub download trends (autogame-17/evolver).

The change mirrors the existing Star History pattern: a heading plus an image badge that points at an external chart page. No application code, config, or CI updates.

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