Add startup message to provide http url to server

src/server/kiwix-serve.cpp

@@ -369,6 +369,10 @@ int main(int argc, char** argv)
     exit(1);
   }
   
+  std::string url = "http://" + server.getAddress() + ":" + std::to_string(server.getPort());
+  std::cout << "The Kiwix server is running and can be accessed in the local network at: "
+            << url << std::endl;
+            
   /* Run endless (until PPID dies) */
   waiting = true;
   do {