Create EXAMPLE folder. Add SFTP-CDN sync script

Add script for synchronizing a remote SFTP folder with a CDN container.

Work-flow:

    user uploads files/folders to SFTP;
    the script will sync the files/folders to the specified container;
    all actions are logged;
    the script will also clean log files older than 3 days (this can be easily changed according to user specification);
    as well, the script can remove obsolete files from the CDN container (if the user deleted files from SFTP, this will remain on CDN until they are deleted);

Some precautions were taken as well:

    the script checks for any undefined variables;
    the script checks if there is another instance running (LOCKING mechanism implemented)

The script is tested and I'm using it via a CRON job.