Add some documentations.

DOC/README.mount_iso

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+
+# - LX Container configuration:
+# -
+lxc.aa_profile = unconfined
+lxc.cgroup.devices.allow = b 7:* rwm
+lxc.cgroup.devices.allow = c 10:237 rwm
+
+# - Note!
+# -    Inside the container, you have to create /dev/loop0
+# -
+# -       sudo mknod /dev/loop0 b 7 0
+
+
+# - Verify if it works:
+# -
+# -    $ truncate --size 100M my.img
+# -    $ mkfs.ext4 -F my.img
+# -    $ sudo mount -o loop,ro my.img /mnt
+# -    $ ls /mnt
+# -    lost+found
+# -    $ sudo umount /mnt
+# -