add new file

common/djangoapps/util/forum_util.py

+from django_comment_client.models import Permission, Role
+
+def seed_permissions_roles(course_id):
+    administrator_role = Role.objects.get_or_create(name="Administrator", course_id=course_id)[0]
+    moderator_role = Role.objects.get_or_create(name="Moderator", course_id=course_id)[0]
+    community_ta_role = Role.objects.get_or_create(name="Community TA", course_id=course_id)[0]
+    student_role = Role.objects.get_or_create(name="Student", course_id=course_id)[0]
+
+    for per in ["vote", "update_thread", "follow_thread", "unfollow_thread",
+                   "update_comment", "create_sub_comment", "unvote", "create_thread",
+                   "follow_commentable", "unfollow_commentable", "create_comment", ]:
+        student_role.add_permission(per)
+
+    for per in ["edit_content", "delete_thread", "openclose_thread",
+                    "endorse_comment", "delete_comment", "see_all_cohorts"]:
+        moderator_role.add_permission(per)
+
+    for per in ["manage_moderator"]:
+        administrator_role.add_permission(per)
+
+    moderator_role.inherit_permissions(student_role)
+
+    # For now, Community TA == Moderator, except for the styling.
+    community_ta_role.inherit_permissions(moderator_role)
+
+    administrator_role.inherit_permissions(moderator_role)
\ No newline at end of file