add (overwrite with) mypy stubs, if available

stdlib/3/queue.pyi

@@ -0,0 +1,20 @@
+# Stubs for queue
+
+# NOTE: These are incomplete!
+
+from typing import Any, TypeVar, Generic
+
+_T = TypeVar('_T')
+
+class Queue(Generic[_T]):
+    def __init__(self, maxsize: int = 0) -> None: ...
+    def full(self) -> bool: ...
+    def get(self, block: bool = True, timeout: float = None) -> _T: ...
+    def get_nowait(self) -> _T: ...
+    def put(self, item: _T, block: bool = True, timeout: float = None) -> None: ...
+    def put_nowait(self, item: _T) -> None: ...
+    def join(self) -> None: ...
+    def qsize(self) -> int: ...
+    def task_done(self) -> None: pass
+
+class Empty: ...