Add happly (PLY file parser) (fffaraz#1537)

Author: toge

README.md

@@ -1163,6 +1163,7 @@ A curated list of awesome C++ (or C) frameworks, libraries, resources, and shiny
 * [fccf](https://github.com/p-ranav/fccf) - A command-line tool that recursively searches a directory to find C/C++ source code matching a search string. [MIT]
 * [{fmt}](https://github.com/fmtlib/fmt) :zap: - Small, safe and fast formatting library for C++. [Simplified BSD] [website](https://fmt.dev)
 * [gcc-poison](https://github.com/leafsr/gcc-poison) - A simple header file for developers to ban unsafe C/C++ functions from applications.
+* [happly](https://github.com/nmwsharp/happly) - A C++ header-only parser for the PLY file format. Parse .ply happily! [MIT]
 * [hedley](https://github.com/nemequ/hedley) - A C/C++ header file designed to smooth over some platform-specific annoyances. [website](https://nemequ.github.io/hedley/)
 * [icecream-cpp](https://github.com/renatoGarcia/icecream-cpp) - A small printing library for debugging purposes. [MIT]
 * [inja](https://github.com/pantor/inja) - A Template Engine for Modern C++. [MIT]