cl-firmata (Common Lisp) added to readme/libraries

Author: bovid-19

readme.md

@@ -88,6 +88,8 @@ Most of the time you will be interacting with Arduino with a client library on t
   * [https://github.com/zankich/rust-firmata](https://github.com/zankich/rust-firmata)
 * Pure Data
   * [https://github.com/NullMember/PDFirmata](https://github.com/NullMember/PDFirmata)
+* Common Lisp
+  * [https://github.com/cjfuller/cl-firmata](https://github.com/cjfuller/cl-firmata)
 
 Note: The above libraries may support various versions of the Firmata protocol and therefore may not support all features of the latest Firmata spec nor all Arduino and Arduino-compatible boards. Refer to the respective projects for details.