Actually add data/fs directory

diff --git a/data/fs/README.md b/data/fs/README.md
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+# data/fs directory
+
+This directory is used as storage for file systems loaded from hard drive images.  
+File systems can be loaded from here in case they're placed here under the correct file name if they're not embeded in the RDB on a hard drive image.
+
+"Correct file name" would be for instance `DOS.1` for `DOS/1` or `PFS.3` for `PFS/3`.  
+Unfortunately this can't yet be used to detect a difference between different revisions of for instance the PFS3AIO file system drivers.