Added human player

a_player.py

@@ -14,9 +14,19 @@ class APlayer(object):
     def set_debug(self, with_debug):
         pass
 
+    @staticmethod
+    def get_potential_moves(state: np.array) -> np.array:
+        st = state.reshape(state.size)
+        indices = [idx for idx, s in enumerate(st) if '-' in s]
+        return np.array(indices)
+
     def move(self, state: np.array):
         return state, False
 
+    def state_from_move(self, state: np.array, field):
+        state.reshape(state.size)[field] = self.mark
+        return state
+
     def reward(self, value):
         pass