Add readme

doc/DESCRIPTION.md

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+Tiny Tiny RSS is a free and open source web-based news feed (RSS/Atom) reader and aggregator.
+
+## Features
+
+- feed aggregation / syndication,
+- OPML import/export,
+- multiple ways to share stuff: export RSS feeds, plugins for various social sites, sharing by URL, etc,
+- sharing arbitrary content through tt-rss,
+- Plugins and themes,
+- podcasts,
+- flexible article filtering

doc/DESCRIPTION_fr.md

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+Tiny Tiny RSS est un lecteur et agrégateur de flux d'actualités (RSS/Atom) en ligne gratuit et open source.

manifest.json

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   },
   "version": "20211221~ynh1",
   "url": "http://tt-rss.org",
+  "upstream": {
+        "license": "GPL-3.0-only",
+        "website": "http://tt-rss.org",
+        "demo": "https://demo.yunohost.org/ttrss/",
+        "admindoc": "https://git.tt-rss.org/git/tt-rss/wiki",
+        "code": "https://git.tt-rss.org/git/tt-rss"
+    },
   "license": "GPL-3.0-only",
   "maintainer": {
     "name": "",