add AR code translator shell

src/ARCodeTranslator-Stub.hh

@@ -0,0 +1,8 @@
+#pragma once
+
+#include <stdexcept>
+#include <string>
+
+inline void run_ar_code_translator(const std::string&) {
+  throw std::runtime_error("resource_file is not available; install it and rebuild newserv");
+}