add class username

conf/urls/oj.py

@@ -1,6 +1,12 @@
 from django.urls import path
 
-from ..views import HitokotoAPI, JudgeServerHeartbeatAPI, LanguagesAPI, WebsiteConfigAPI
+from ..views import (
+    HitokotoAPI,
+    JudgeServerHeartbeatAPI,
+    LanguagesAPI,
+    WebsiteConfigAPI,
+    ClassUsernamesAPI,
+)
 
 urlpatterns = [
     path("website", WebsiteConfigAPI.as_view()),
@@ -8,4 +14,5 @@ urlpatterns = [
     path("judge_server_heartbeat/", JudgeServerHeartbeatAPI.as_view()),
     path("languages", LanguagesAPI.as_view()),
     path("hitokoto", HitokotoAPI.as_view()),
+    path("class_usernames", ClassUsernamesAPI.as_view()),
 ]