How to add any image to JIG

dummy-rss.xml

<?xml version="1.0" ?>
<rss version="2.0">
    <channel>
        <title>Title of the test feed</title>
        <description>To get external images to JIG</description>
        <link>http://justifiedgrid.com/</link>
        <item>
            <title>The first photo</title>
            <description><![CDATA[
                <img src="http://dummyimage.com/600x600/3e2723/ff5722/&text=Dummy photo" />
                this is just an example with a link and a date
            ]]></description>
            <link>http://dummyimage.com/</link>
            <pubDate>Thu, 25 Jun 2015 15:16:42 GMT</pubDate>
        </item>
        <item>
            <title>The second one</title>
            <description><![CDATA[
                <img src="http://dummyimage.com/1280x720/795548/ffc107" />
                using some dummy images, no date, no link
            ]]></description>
        </item>
    </channel>
</rss>