Convert README to markdown

README → README.md

-This gnome-disk-utility repository provides libraries and applications for dealing
-with storage devices.
-Development location:
-https://gitlab.gnome.org/GNOME/gnome-disk-utility
+# gnome-disk-utility
+
+This gnome-disk-utility repository provides libraries and applications for
+dealing with storage devices.
+
+Development location: https://gitlab.gnome.org/GNOME/gnome-disk-utility
+
+## GNOME Disks
 
-GNOME Disks:
 View, modify and configure disks and media
-https://wiki.gnome.org/Apps/Disks
 
-gnome-disk-image-mounter:
+Homepage: https://wiki.gnome.org/Apps/Disks
+
+## gnome-disk-image-mounter
+
 Attach and mount disk images
 
-gsd-disk-utility-notify:
+## gsd-disk-utility-notify
+
 gnome-disk-utility notification plugin for GNOME Settings Daemon
 Disk health failure notification (SMART status)