first add files

lib/Crypto/IO/_PBES.pyi

@@ -0,0 +1,19 @@
+from typing import Dict, Optional, Callable
+
+class PbesError(ValueError):
+    ...
+
+class PBES1(object):
+    @staticmethod
+    def decrypt(data: bytes, passphrase: bytes) -> bytes: ...
+
+class PBES2(object):
+    @staticmethod
+    def encrypt(data: bytes,
+                passphrase: bytes,
+		protection: str,
+		prot_params: Optional[Dict] = ...,
+		randfunc: Optional[Callable[[int],bytes]] = ...) -> bytes: ...
+
+    @staticmethod
+    def decrypt(data:bytes, passphrase: bytes) -> bytes: ...