first add files

lib/Crypto/Signature/PKCS1_PSS.pyi

@@ -0,0 +1,7 @@
+from typing import Optional, Callable
+
+from Crypto.PublicKey.RSA import RsaKey
+from Crypto.Signature.pss import PSS_SigScheme
+
+
+def new(rsa_key: RsaKey, mgfunc: Optional[Callable]=None, saltLen: Optional[int]=None, randfunc: Optional[Callable]=None) -> PSS_SigScheme: ...