added example crontab

cron/crontab-example

@@ -0,0 +1,14 @@
+# /etc/crontab: system-wide crontab
+# Unlike any other crontab you don't have to run the `crontab'
+# command to install the new version when you edit this file
+# and files in /etc/cron.d. These files also have username fields,
+# that none of the other crontabs do.
+
+SHELL=/bin/sh
+PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin
+
+# m h dom mon dow user	command
+# SCRIPTS FOR CUSF-STANDALONE-PREDICTOR
+0 1 * * * www-data /var/www/hab/predict/cron/clear-pydap-cache-cronjob.sh
+10 1 * * * www-data /var/www/hab/predict/cron/prune-predictions-cronjob.sh
+