Add ezdxf stubs

stubs/ezdxf/__init__.pyi

@@ -0,0 +1,12 @@
+from typing import Any, TextIO, Iterable
+from .layouts import Modelspace, BlockRecords
+
+class Drawing:
+    blocks: BlockRecords
+    @property
+    def layers(self) -> Iterable[Any]: ...
+    def modelspace(self) -> Modelspace: ...
+    def write(self, stream: TextIO) -> None: ...
+
+def new(version: str = ..., setup: bool = ...) -> Drawing: ...
+def read(stream: TextIO) -> Drawing: ...