Added examples on how to call the function

OpenSSL/X509/Request.hs

@@ -300,6 +300,11 @@ makeX509FromReq req caCert
 
          return cert
 
+-- Add Extensions to certificate (when Server accepting certs requires it)
+-- e.g. :
+-- addExtensionToX509 cert1 87 "CA:FALSE"
+-- addExtensionToX509 cert1 85 "critical,serverAuth, clientAuth" - when this extension field is critical
+
 addExtensionToX509 :: X509 -> Int -> String -> IO Bool
 addExtensionToX509 (Cert.X509 certFPtr) nid value = do
     -- Context and config pointers are set to nullPtr for simplicity.