add judge_server related api

conf/urls/admin.py

@@ -1,8 +1,9 @@
 from django.conf.urls import url
 
-from ..views import WebsiteConfigAPI, SMTPAPI
+from ..views import WebsiteConfigAPI, SMTPAPI, JudgeServerAPI
 
 urlpatterns = [
     url(r'^smtp$', SMTPAPI.as_view(), name="smtp_admin_api"),
     url(r'^website$', WebsiteConfigAPI.as_view(), name="website_config_api"),
+    url(r'^judge_server', JudgeServerAPI.as_view(), name="judge_server_api")
 ]