message: Add new error message for payment commands in cli
diff: @@ -104,6 +104,7 @@ pub fn handle_payment_error(err: ErrorCode, payment_method: Option<&str>) {
  ErrorCode::PaymentSourceDoesNotExistError => println_err!("Payment source not found"),
  ErrorCode::PaymentOperationNotSupportedError => println_err!("Payment operation not supported"),
  ErrorCode::CommonInvalidStructure => println_err!("Invalid format of command params. Please check format of posted JSONs, Keys, DIDs and etc..."),
  + ErrorCode::WalletItemAlreadyExists => println_err!("Payment address already exists"),
  err => println_err!("Indy SDK error occurred {:?}", err)
  }
  }
  