rss: added rss and freshrss and linked it to linkding

wiki/freshrss.md

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+# FreshRss
+
+[FreshRSS](https://freshrss.org/) is a self hosted [RSS-Feed](/wiki/rss.md) aggregator.
+
+## Setup
+
+The software can be setup via [Docker](/wiki/docker.md) with the
+[linuxserver image](/wiki/docker/linuxserver_-_freshrss.md).

wiki/rss.md

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+# RSS
+
+Rich Site Summary (RSS) is a format for web feeds.
+RSS shows changed and added news articles, blog entries or audio/video logs.
+It is most prominently used for the distribution of podcasts.
+
+## Clients
+
+This sections lists various RSS clients.
+
+- [FreshRSS](/wiki/freshrss.md) is a self-hosted RSS aggregator with a web interface.
+- [Feeder](https://f-droid.org/de/packages/com.nononsenseapps.feeder/) is an RSS reader for
+  Android phones available on [F-Droid](/wiki/android/f-droid.md).