doc: optimize README (#367)

Author: fumiama

README.md

@@ -200,3 +200,9 @@ In the current released model, the only token-level control units are `[laugh]`,
 ## Starchart
 
 [![Star History Chart](https://api.star-history.com/svg?repos=2noise/ChatTTS&type=Date)](https://star-history.com/#2noise/ChatTTS&Date)
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+<div align="center">
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+![counter](https://counter.seku.su/cmoe?name=chattts&theme=nix)
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+</div>