Add example for restore command with restic

[Kirill]

In README you write example for backup all docker container with restic. I create repository, create backup for this repository. I see next in docker-backup and see restore: docker-backup restore <backup file>. Which file? Where I can found it? In repo I see 5 folders and config file. Please provide restore command for backup

docker-backup backup --all --launch "restic -r /dest backup --password-file pwfile --tag %tag --files-from %list"