Add link to common lisp implementation (#30)

Author: chee

src/_includes/partials/implementations.md

@@ -17,6 +17,7 @@
 * C++: [kdlpp](https://github.com/tjol/ckdl) (part of ckdl, requires C++20)
 * OCaml: [ocaml-kdl](https://github.com/Bannerets/ocaml-kdl)
 * Nim: [kdl-nim](https://github.com/Patitotective/kdl-nim)
+* Common Lisp: [kdlcl](https://github.com/chee/kdlcl)
 
 ## Editor Support