Added an script to start the socat program.

scripts/start_socat.sh

+#!/bin/bash
+
+if [ ! -f "/tmp/$1_gazebo" ]; then
+  socat -d -d pty,raw,echo=0,link=/tmp/$1_gazebo pty,raw,echo=0,link=/tmp/$1_user &
+
+  while true; do sleep 2; done
+fi
+