add Calispel

fixes CodyReichert#290

Author: vindarel

README.md

@@ -994,6 +994,8 @@ Parallelism and Concurrency
 * :star: [BordeauxThreads](https://common-lisp.net/project/bordeaux-threads/) - Portable, shared-state concurrency. [Expat][14].
 * :star: [lparallel](https://github.com/lmj/lparallel) - A library for parallel programming. [3-clause BSD][15].
 * [lfarm](https://github.com/lmj/lfarm) - distributing work across machines (on top of lparallel and usocket). [BSD_3Clause][15]
+* [calispel](https://github.com/hawkir/calispel) - [CSP](https://en.wikipedia.org/wiki/Communicating_sequential_processes)-like channels for common lisp. With blocking, optionally buffered channels and a "CSP select" statement. ISC-style.
+  - "It is complete, flexible and easy to use. I would recommend Calispel over Lparallel and ChanL." @Ambrevar. [discussion](https://github.com/CodyReichert/awesome-cl/issues/290)
 * [chanl](https://github.com/zkat/chanl) - Portable, channel-based concurrency. [Expat][14], with parts under [3-clause BSD][15].
 * [cl-async](https://github.com/orthecreedence/cl-async) - A library for general-purpose, non-blocking programming. [Expat][14].
 * [Moira](https://github.com/TBRSS/moira) -  Monitor and restart background threads. In-lisp process supervisor. [MIT][200].