add rss feed page

docs/rocky/rss.md

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+---
+title: Rocky Linux RSS Feeds
+---
+
+This page goes over the RSS feeds provided by the Rocky Linux project.
+
+## About RSS Feeds
+
+Rocky Linux RSS feeds are provided as an alternative way for users to observe
+updates that come to the many repositories for supported versions of Rocky Linux.
+
+RSS feeds will appear in the public mirror: [RSS Feeds](https://dl.rockylinux.org/pub/feeds)
+
+These feeds are generated by the SIG/Core or Release Engineering [Toolkit](https://git.resf.org/sig_core/toolkit/src/branch/devel/mangle/generators/rss.py).
+
+## Notes on Refresh Times
+
+Every 30 minutes, the feeds are updated. If new packages were added to any of
+the repositories, they will appear right away on next refresh.
+
+## Notes on Packages
+
+The feeds will show the most recent packages up to 30 days. If a package is
+older than 30 days, they will be dropped from the feed.
+
+## Notes on Modules
+
+Some module packages may or may not appear in the feed. This is especially true
+for Rocky Linux 8. The RSS feed script is at this time not capable of
+taking into account of all modules. Notable exceptions to this are the default
+module streams.