Add libfork (tasking library with coroutine) (fffaraz#1518)

Author: toge

README.md

@@ -307,6 +307,7 @@ A curated list of awesome C++ (or C) frameworks, libraries, resources, and shiny
 * [Libclsph](https://github.com/libclsph/libclsph) - An OpenCL based GPU accelerated SPH fluid simulation library. [MIT]
 * [libdill](https://github.com/sustrik/libdill/) - Introduces structured concurrency in C. [MIT]
 * [libdispatch](https://github.com/apple/swift-corelibs-libdispatch) - Grand Central Dispatch (GCD), developed by Apple Inc., is a task parallelism technology based on the thread pool pattern. libdispatch is a library that provides the implementation of GCD's services. [Apache-2.0] [website](https://apple.github.io/swift-corelibs-libdispatch/)
+* [libfork](https://github.com/ConorWilliams/libfork) - A bleeding-edge, lock-free, wait-free, continuation-stealing tasking library built on C++20's coroutines. [MPL-2.0] [website](https://conorwilliams.github.io/libfork/)
 * [libmill](https://github.com/sustrik/libmill/) - Introduces Go-style concurrency in C. [MIT]
 * [marl](https://github.com/google/marl) - Marl is a hybrid thread / fiber task scheduler written in C++ 11. [Apache-2.0]
 * [moderngpu](https://github.com/moderngpu/moderngpu) - moderngpu is a productivity library for general-purpose computing on GPUs. It is a header-only C++ library written for CUDA. The unique value of the library is in its accelerated primitives for solving irregularly parallel problems. [FreeBSD & Copyright, Sean Baxter]