PleaseUpdate: add description

<?xml version="1.0" ?>
<freevo>
    <slideshow title="foo" random="1|0" repeat="1|0">
        <cover-img>foo.jpg</cover-img>
        <background-music random="1|0">
            <directory recursive="1|0">path</directory>
            <file>filename</file>
        </background-music>
        <files>
            <directory recursive="1|0" duration="10">path</directory>
            <file duration="0">filename</file>
        </files>
        <info>
            <description>A nice description</description>
        </info>
    </slideshow>
</freevo>