Add Chataigne as a client software into README.md

Chataigne is an Artist-friendly Modular Machine for Art and Technology, with support to websockets & custom modules for OBS

Author: KopiasCsaba

README.md

@@ -43,6 +43,7 @@ It is **highly recommended** to keep obs-websocket protected with a password aga
 - [Bitfocus Companion Module](https://bitfocus.io/companion/)
 - [MacroGraph](https://github.com/Brendonovich/macrograph) - hosted client [here](https://macrograph.brendonovich.dev/)
 - [MATRIC](https://matricapp.com/)
+- [Chataigne](https://benjamin.kuperberg.fr/chataigne/)
 
 ### Client libraries (for developers)