docs: add benchmarks to readme

README.md

@@ -1,3 +1,7 @@
+## Is it fast?
+
+![Yes, it's fast](https://raw.githubusercontent.com/hawkw/thingbuf/main/assets/async_mpsc_integer/lines.svg)
+
 ## FAQs
 
 - **Q: Why did you make this?**

assets/async_mpsc_integer/lines.svg

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+Sending 1000 i32s (async): Comparison
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+Average time (ms)
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