put in agent parsing skeleton

src/primaite/game/agent/rewards.py

@@ -0,0 +1,20 @@
+from abc import ABC, abstractmethod
+from typing import Any, Dict, List
+
+from pydantic import BaseModel
+
+
+class AbstractReward(BaseModel):
+    def __call__(self, states: List[Dict]) -> float:
+        """_summary_
+
+        :param state: _description_
+        :type state: Dict
+        :return: _description_
+        :rtype: float
+        """
+        ...
+
+
+class RewardFunction(BaseModel):
+    ...