Add geo-utils to Math (#1831)

Author: gistrec

README.md

@@ -892,6 +892,7 @@ A curated list of awesome C++ (or C) frameworks, libraries, resources, and shiny
 * [Eigen](http://eigen.tuxfamily.org/) - A high-level C++ library of template headers for linear algebra, matrix and vector operations, numerical solvers and related algorithms. [MPL2]
 * [ExprTk](https://www.partow.net/programming/exprtk/) - The C++ Mathematical Expression Toolkit Library (ExprTk) is a simple to use, easy to integrate and extremely efficient run-time mathematical expression parser and evaluation engine. [MIT]
 * [Fastor](https://github.com/romeric/Fastor) - A lightweight high performance tensor algebra framework for modern C++. [MIT]
+* [geo-utils](https://github.com/gistrec/geo-utils) - Header-only C++17 library for spherical lat/lng geometry: distance, bearing, area, point-in-polygon. [Apache2]
 * [Geometric Tools](https://www.geometrictools.com) - C++ library for computing in the fields of mathematics, graphics, image analysis and physics. [Boost] [website](https://www.geometrictools.com)
 * [GLM](https://github.com/g-truc/glm) - Header-only C++ math library that matches and inter-operates with OpenGL's GLSL math. [MIT] [website](https://glm.g-truc.net/)
 * [GMTL](http://ggt.sourceforge.net/) - Graphics Math Template Library is a collection of tools implementing Graphics primitives in generalized ways. [GPL2]