Download Repo installer and install it via XBMC's addon manager (Install from zip file).
RSS Client (script.rssclient-standalone)
Standalone RSS Client. Provides dedicated GUI for browsing through RSS Feeds. Allow user to open attached media (Images and Videos). Skinning readme How To
RSS Client Background (script.rssclient)
Addon meant to run in background (like RecentlyAdded script). It allows including RSS feeds into skins (to Home window for instance). For info go to How To