Add cronjob to fetch new timetable data from HSL

add_cronjob.sh

@@ -0,0 +1,11 @@
+#!/bin/bash
+
+echo "Adding cron entries..."
+# write out current crontab
+crontab -l > temp_crontab
+# echo new cron into cron file
+printf "*/5 * * * * source $PWD/../virtualenv.sikweb/bin/activate && python $PWD/manage.py hsl &>$PWD/logs/fetch_hsl.log\n\n" >> temp_crontab
+# install new cron file
+crontab temp_crontab
+rm temp_crontab
+echo "Done. View your crontab with 'crontab -l' and edit it with 'crontab -e'."