add anacrontab command template

setup

@@ -137,6 +137,8 @@ get_restic() {
     # backup tool
     sudo apt-get install -y restic
     sudo restic self-update
+    echo "restic installed and updated"
+    echo "to schedule backup:\nsudo -e /etc/anacrontab\n7 7 $HOME/.dotfiles/bin/restic_backup $HOME/backup/restic_repos/<XXX> $HOME/.dotfiles/secrets/restic_password/<XXX>"
 }
 
 ### functions below this line are not included in `all` and should be run manually / if needed