add ForeignKey

django-stubs/db/models/fields/related.pyi

@@ -0,0 +1,14 @@
+from typing import Type, Union, TypeVar, Any, Generic
+
+from django.db import models
+from django.db.models import Field
+
+_T = TypeVar('_T', bound=models.Model)
+
+
+class ForeignKey(Field, Generic[_T]):
+    def __init__(self,
+                 to: Union[Type[_T], str],
+                 on_delete: Any,
+                 **kwargs): ...
+    def __get__(self, instance, owner) -> _T: ...