[gparted] Add Linux SWRaid / mdadm note to the README file (#756829)

[Curtis Gedak <gedakc src gnome org>]

commit 28ad527874e73875b64cdfea5806e1d7c9e0f29d
Author: Mike Fleetwood <mike fleetwood googlemail com>
Date:   Fri Jan 1 13:56:11 2016 +0000

    Add Linux SWRaid / mdadm note to the README file (#756829)
    
    Missed earlier when implementing the feature.
    
    Bug 756829 - SWRaid member detection enhancements

 README |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)
---
diff --git a/README b/README
index 2d9805e..8c57e10 100644
--- a/README
+++ b/README
@@ -234,6 +234,12 @@ For LVM2 Physical Volume support the following command is required:
 And device-mapper support in the kernel.
 
 
+For accurate detection and reporting of Linux Software RAID Arrays the
+following command is required:
+
+   mdadm           - SWRaid administration tool
+
+
 For attempt data rescue for lost partitions, the following package
 is required:
    gpart           - guesses PC-type hard disk partitions