Event modifs and README update

events/event.py

@@ -21,6 +21,10 @@ class Event(Serializable):
     def remove_entity(self, entity_id:str):
         if entity_id in self.entities:
             self.entities.remove(entity_id)
+    
+    def add_entity(self, entity_id:str):
+        if not entity_id in self.entities:
+            self.entities.append(entity_id)
 
     def get_current_turn(self):
         idx = len(self.turns) - 1