Add notes on visualization and web_version branch in README

Updated the README to mention the use of pygame-ce for visualization. Included a reference to the web_version branch for ongoing web-based development.

README.md

@@ -96,6 +96,9 @@ cooperative-cuisine study-server -s localhost -sp 8080 -g localhost -gp 8000 --m
 cooperative-cuisine gui -s localhost -sp 8080 -g localhost -gp 8000
 ```
 
+Currently, the visualization is done via [pygame-ce](https://pypi.org/project/pygame-ce/). 
+You can check out our development around the webversion in the [web_version branch](https://gitlab.ub.uni-bielefeld.de/scs/cocosy/cooperative-cuisine/-/tree/web_version).
+
 ## Configuration
 The environment configuration is currently done with 3 config files + GUI configuration.