added uptime.sh

uptime.sh is a sysv-init script which is executed when my server gets halted

bash/uptime.sh

@@ -0,0 +1,11 @@
+#!/bin/bash
+
+### BEGIN INIT INFO
+# Provides:          uptime
+# Required-Start:    $remote_fs
+# Required-Stop:     $remote_fs
+# Default-Stop:      0 1 6
+# Short-Description: Log uptime of server before shutdown
+### END INIT INFO
+
+echo $(date +%s)  $(cat /proc/uptime) >> /var/log/uptime.log