Update capitalization in README title

The README title has been adjusted to use proper title case. "cooperative_cuisine Simulator" has been corrected to "Cooperative Cuisine Simulator" for better readability and consistency with standard title formatting.

README.md

-# cooperative_cuisine Simulator
+# Cooperative Cuisine Simulator
 
 [Documentation](https://scs.pages.ub.uni-bielefeld.de/cocosy/overcooked-simulator)