add clean django-stubs folder, add some tests

django-stubs/contrib/postgres/fields/__init__.pyi

@@ -0,0 +1 @@
+from .array import ArrayField as ArrayField

django-stubs/contrib/postgres/fields/array.pyi

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+from typing import List, Any
+
+from django.contrib.postgres.fields.mixins import CheckFieldDefaultMixin
+from django.db.models import Field
+
+
+class ArrayField(CheckFieldDefaultMixin, Field):
+    def __init__(self,
+                 base_field: Field,
+                 **kwargs): ...
+    def __get__(self, instance, owner) -> List[Any]: ...

django-stubs/contrib/postgres/fields/mixins.pyi

@@ -0,0 +1,2 @@
+class CheckFieldDefaultMixin:
+    pass

django-stubs/db/models/__init__.pyi

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+from .base import Model as Model
+
+from .fields import (AutoField as AutoField,
+                     IntegerField as IntegerField,
+                     CharField as CharField,
+                     Field as Field)

django-stubs/db/models/base.pyi

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+class ModelBase(type):
+    pass
+
+
+class Model(metaclass=ModelBase):
+    pass

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

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+from typing import Any
+
+from django.db.models.query_utils import RegisterLookupMixin
+
+
+class Field(RegisterLookupMixin):
+    def __init__(self,
+                 primary_key: bool = False,
+                 **kwargs): ...
+    def __get__(self, instance, owner) -> Any: ...
+
+
+class IntegerField(Field):
+    def __get__(self, instance, owner) -> int: ...
+
+
+class AutoField(Field):
+    def __get__(self, instance, owner) -> int: ...
+
+
+class CharField(Field):
+    def __init__(self,
+                 max_length: int,
+                 **kwargs): ...
+    def __get__(self, instance, owner) -> str: ...
+

django-stubs/db/models/query_utils.pyi

@@ -0,0 +1,2 @@
+class RegisterLookupMixin:
+    pass