Add documentation for import-rdiff-backup

Signed-off-by: Zoran Zaric <zz@zoranzaric.de>
Reviewed-by: Gabriel Filion <lelutin@gmail.com>

diff --git a/Documentation/bup-import-rdiff-backup.md b/Documentation/bup-import-rdiff-backup.md
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+% bup-import-rdiff-backup(1) Bup %BUP_VERSION%
+% Zoran Zaric <zz@zoranzaric.de>
+% %BUP_DATE%
+
+# NAME
+
+bup-import-rdiff-backup - import a rdiff-backup archive
+
+# SYNOPSIS
+
+bup import-rdiff-backup [-n] <path to rdiff-backup root> <backup name>
+
+# DESCRIPTION
+
+`bup import-rdiff-backup` imports a rdiff-backup archive. The
+timestamps for the backups are preserved and the path to
+the rdiff-backup archive is stripped from the paths.
+
+# OPTIONS
+
+-n,--dry-run
+:   don't do anything just print out what would be done
+
+# EXAMPLES
+
+    $ bup import-rdiff-backup /.snapshots legacy-rdiff-backup
+
+# BUP
+
+Part of the `bup`(1) suite.