add message

announcement/urls/oj.py

@@ -1,7 +1,8 @@
 from django.urls import re_path as url
 
-from ..views.oj import AnnouncementAPI
+from ..views.oj import AnnouncementAPI, MessageAPI
 
 urlpatterns = [
     url(r"^announcement/?$", AnnouncementAPI.as_view(), name="announcement_api"),
+    url(r"^message/?$", MessageAPI.as_view(), name="message_api"),
 ]