Add readme.

README.md

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+# tarback
+
+Create a tar archive from remote resources.
+
+This is more or less equivalent to `ssh host tar files | xz | split
+output-file` and its reverse.
+
+Two plugins are available:
+- `ssh` handles all the ssh command and filename escaping necessary
+- `docker` instead of backing up a remote volume, back up a docker volume
+
+## usage
+
+`tarback -p ssh,docker -s 'ssh $user@$host' create "$remote_volume_name" "$local_tar_archive"`
+
+Create a split tar archive of the remote volume, with the extensions `part{a-z,a-z}`.
+
+`tarback -p ssh,docker -s 'ssh $user@$host' restore "$local_tar_archive" "$remote_volume_name"`
+
+Restore the backup to the remote docker volume.