Update README.md [skip ci]

Author: mrdav30

README.md

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 ![FixedMathSharp Icon](https://raw.githubusercontent.com/mrdav30/fixedmathsharp/main/icon.png)
 
+[![.NET CI](https://github.com/mrdav30/FixedMathSharp/actions/workflows/dotnet.yml/badge.svg)](https://github.com/mrdav30/FixedMathSharp/actions/workflows/dotnet.yml)
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 **A high-precision, deterministic fixed-point math library for .NET.**  
 Ideal for simulations, games, and physics engines requiring reliable arithmetic without floating-point inaccuracies.
 
@@ -175,4 +177,4 @@ for details.
 
 For questions or support, reach out to **mrdav30** via GitHub or open an issue in the repository.
 
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