feat(overcooked): Basic README

jaxmarl/environments/overcooked_v2/README.md

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+# OvercookedV2
+
+OvercookedV2 is an extended version of the original Overcooked environment. It introduces meaningful partial observability and increased stochasticity to enable more complex coordination challenges.
+
+## Key Features
+
+- Configurable agent view radius
+- Multiple ingredients and recipes
+- Asymmetric information through recipe indicators
+- Randomized starting positions and directions
+- Grounded communication via button recipe indicators
+- Flexible layout creation
+
+## Custom Layouts
+
+Create custom layouts using ASCII strings:
+
+```python
+layout = """
+WWPWW
+0A A1
+L   R
+WBWXW
+"""
+recipes = [[0,0,1], [0,1,1]]
+custom_layout = Layout.from_string(layout, possible_recipes=recipes)
+```
+
+## Pre-configured Layouts
+
+See `layouts.py` for a variety of pre-configured layouts:
+
+- Adaptations of original Overcooked layouts
+- Extended Cat-Dog problem layouts
+- Test-time coordination challenge layouts
+
+## Observations
+
+Observations are structured as a width x height x num_channels tensor, with partial observability based on the configured view radius.
+
+## Rewards
+
+- 20 points for correct deliveries
+- Optional -20 points for incorrect deliveries
+- Shaped rewards for actions aligned with the current recipe
+
+## Visualization and Interactive Play
+
+- JIT-compiled rendering pipeline for efficient episode visualization
+- Interactive mode for playing alongside trained policies
+