Create README.md

Author: ctreffs

README.md

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+# FirebladeMath
+
+[![license](https://img.shields.io/badge/license-MIT-brightgreen.svg)](LICENSE)
+[![github CI](https://github.com/fireblade-engine/math/workflows/CI/badge.svg)](https://github.com/fireblade-engine/math/actions?query=workflow%3ACI)
+
+A dependency free, lightweight, fast math library for 2D and 3D vectors, quaternions and matrices in Swift with (optional) SIMD support.