Added meta, a runtime reflection library

Added meta: header-only, non-intrusive and macro-free runtime reflection system written in C++17. MIT license.

Author: skypjack

README.md

@@ -724,6 +724,7 @@ A curated list of awesome C++ (or C) frameworks, libraries, resources, and shiny
 * [libnih](https://github.com/keybuk/libnih) - A lightweight library of C functions and structures. [GPL2.1]
 * [libusb](http://www.libusb.org/) - A universal USB library which allows for portable access to USB devices. [LGPL2]
 * [Mach7](https://github.com/solodon4/Mach7) - A Pattern-matching library for C++. [BSD]
+* [meta](https://github.com/skypjack/meta) - Header-only, non-intrusive and macro-free runtime reflection system in C++. [MIT]
 * [pdqsort](https://github.com/orlp/pdqsort) - Pattern-defeating quicksort. [zlib]
 * [PHP-CPP](https://github.com/CopernicaMarketingSoftware/PHP-CPP) - A library to build PHP extensions with C++. [Apache2] [website](http://www.php-cpp.com/)
 * [Remote Call Framework](http://www.deltavsoft.com/) - Inter-process communication framework for C++. [GPL2/Commercial]