You can easy use the RSSfeedGenerator.
Put in your global template (into the html head) this line:
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<link rel="alternate" type="application/rss+xml" title="pages updates" href="{% lucidTag RSSfeedGenerator count="10" %}" />
To add a normal link into your CMS page use this line:
<a href="{% lucidTag RSSfeedGenerator count="10" %}" type="application/rss+xml" title="page updates">RSS feed</a>
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