add BaseManager.create() typechecking

mypy_django_plugin/config.py

@@ -0,0 +1,21 @@
+from configparser import ConfigParser
+from typing import Optional
+
+from dataclasses import dataclass
+
+
+@dataclass
+class Config:
+    django_settings_module: Optional[str] = None
+    ignore_missing_settings: bool = False
+
+    @classmethod
+    def from_config_file(self, fpath: str) -> 'Config':
+        ini_config = ConfigParser()
+        ini_config.read(fpath)
+        if not ini_config.has_section('mypy_django_plugin'):
+            raise ValueError('Invalid config file: no [mypy_django_plugin] section')
+        return Config(django_settings_module=ini_config.get('mypy_django_plugin', 'django_settings',
+                                                            fallback=None),
+                      ignore_missing_settings=ini_config.get('mypy_django_plugin', 'ignore_missing_settings',
+                                                             fallback=False))