add new actions and AI

src/classes/event.py

@@ -0,0 +1,19 @@
+"""
+event class
+"""
+from dataclasses import dataclass
+
+from src.classes.calendar import Month, Year
+
+@dataclass
+class Event:
+    year: Year
+    month: Month
+    content: str
+
+    def __str__(self) -> str:
+        return f"{self.year}年{self.month}月: {self.content}"
+
+class NullEvent:
+    def __str__(self) -> str:
+        return ""