Add ArrayFire to Concurrency

Author: u1234x1234

README.md

@@ -167,6 +167,7 @@ A curated list of awesome C/C++ frameworks, libraries, resources, and shiny thin
 ## Concurrency
 *Concurrency and Multithreading*
 
+* [ArrayFire](https://github.com/arrayfire/arrayfire) - A general purpose GPU library. [BSD]
 * [Boost.Compute](https://github.com/boostorg/compute) - A C++ GPU Computing Library for OpenCL. [Boost]
 * [Bolt](https://github.com/HSA-Libraries/Bolt) - A C++ template library optimized for GPUs. [Apache2]
 * [C++React](https://github.com/schlangster/cpp.react) - A reactive programming library for C++11. [Boost]