Added xml2kdl to the list of implementations. (#18)

Author: Devasta

src/_includes/partials/implementations.md

@@ -10,6 +10,7 @@
 * PHP: [kdl-php](https://github.com/kdl-org/kdl-php)
 * Python: [kdl-py](https://github.com/daeken/kdl-py)
 * Elixir: [kuddle](https://github.com/IceDragon200/kuddle)
+* XSLT: [xml2kdl](https://github.com/Devasta/XML2KDL)
 
 ## Editor Support