add API endpoints and admin views for authentication module

core/authentication/admin.py

@@ -0,0 +1,17 @@
+from django.contrib import admin
+from django.contrib.auth.admin import UserAdmin
+
+from authentication.models import ExtendedUser
+
+
+class ExtendedUserAdmin(UserAdmin):
+    list_display = ('username', 'email', 'first_name', 'last_name', 'is_staff', 'is_superuser')
+    search_fields = ('username', 'email', 'first_name', 'last_name')
+    ordering = ('username',)
+    filter_horizontal = ('groups', 'user_permissions', 'permissions')
+
+    def permissions(self, obj):
+        return ', '.join(obj.get_all_permissions())
+
+
+admin.site.register(ExtendedUser, ExtendedUserAdmin)