Add custom user creation form

feudal/backend/admin.py

@@ -2,6 +2,7 @@
 from django.contrib import admin
 from django.contrib.auth.admin import UserAdmin
 from django.contrib.auth.models import Group as AuthGroup
+from django.contrib.auth.forms import UserCreationForm
 
 from polymorphic.admin import PolymorphicParentModelAdmin, PolymorphicChildModelAdmin
 
@@ -11,6 +12,14 @@ from .auth.v1.models import OIDCConfig
 from .auth.v1.models.vo import VO, Group, Entitlement, EntitlementNameSpace
 
 
+# from https://docs.djangoproject.com/en/2.2/topics/auth/customizing/#custom-users-and-the-built-in-auth-forms
+class CustomUserCreationForm(UserCreationForm):
+
+    class Meta(UserCreationForm.Meta):
+        model = models.User
+        fields = UserCreationForm.Meta.fields + ('user_type',)
+
+
 class TypeFilter(admin.SimpleListFilter):
     title = 'Type'
     parameter_name = 'user_type'