Update README.md with star graph

Author: JoeStrout

README.md

@@ -9,3 +9,9 @@ This project contains the source code of both C# and C++ implementations of the
 MiniScript is free, and apart from a small amount of revenue from the [books](https://miniscript.org/books/) and [Unity asset](https://assetstore.unity.com/packages/tools/integration/miniscript-87926), generates no significant income.  Your support is greatly appreciated, and will be used to fund community growth & reward programs like [these](https://miniscript.org/earn.html).
 
 So, [click here to sponsor](https://github.com/sponsors/JoeStrout) -- contributions of any size are greatly appreciated!
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+## Star History
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+[![Star History Chart](https://api.star-history.com/svg?repos=JoeStrout/miniscript&type=date&legend=top-left)](https://www.star-history.com/#JoeStrout/miniscript&type=date&legend=top-left)
+
+Click the ⭐️ at the top to help push this graph up!  Every like helps more people discover MiniScript.