Add cpr library to the networking category

Author: whoshuu

README.md

@@ -384,6 +384,7 @@ A curated list of awesome C/C++ frameworks, libraries, resources, and shiny thin
 * [Boost.Asio](http://think-async.com/) :zap: - A cross-platform C++ library for network and low-level I/O programming. [Boost]
 * [Casablanca](http://casablanca.codeplex.com/) - C++ REST SDK. [Apache2]
 * [cpp-netlib](http://cpp-netlib.org/) - A collection of open-source libraries for high level network programming. [Boost]
+* [cpr](https://github.com/whoshuu/cpr) - A modern C++ HTTP requests library with a simple but powerful interface. Modeled after the Python Requests module. [MIT] [website](https://whoshuu.github.io/cpr/)
 * [Dyad.c](https://github.com/rxi/dyad) - Asynchronous networking for C. [MIT]
 * [libcurl](http://curl.haxx.se/libcurl/) - Multiprotocol file transfer library. [MIT/X derivate license]
 * [libjingle](https://code.google.com/p/libjingle/) - Google talk voice and P2P interoperability library. [BSD]