add readme

http-api/app/rules/enrollment.py

@@ -1,6 +1,6 @@
 from datetime import timedelta
 from enum import Enum
-from typing import Literal, TypedDict
+from typing import TypedDict
 from uuid import uuid4
 
 from layercake.dateutils import now, ttl
@@ -23,11 +23,6 @@ class Author(TypedDict):
 class Vacancy(TypedDict): ...
 
 
-class Rel(TypedDict):
-    id: str
-    scope: Literal['ORG', 'USER', 'ENROLLMENT']
-
-
 class LifecycleEvents(str, Enum):
     """Lifecycle events related to scheduling actions."""