add versor to math libs

Author: patricio-astudillo

README.md

@@ -396,6 +396,7 @@ A curated list of awesome C/C++ frameworks, libraries, resources, and shiny thin
 * [NT2](https://github.com/jfalcou/nt2) - A SIMD-optimized numerical template library that provides an interface with MATLAB-like syntax. [Boost]
 * [LibTomMath](https://github.com/libtom/libtommath) - A free open source portable number theoretic multiple-precision integer library written entirely in C. [PublicDomain & WTFPL] [website](http://www.libtom.net/)
 * [QuantLib](https://github.com/lballabio/quantlib) - A free/open-source library for quantitative finance. [Modified BSD] [website](http://quantlib.org/)
+* [Versor](http://versor.mat.ucsb.edu/) - A (fast) Generic C++ library for Geometric Algebras, including Euclidean, Projective, Conformal, Spacetime (etc).
 
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