README.md: Add important noticeomemo

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 # `xxcc` is a XMPP Chat Client
 
+## Important notice
+
+Development for `xxcc` **has been halted** due to `QXmpp` only supporting
+OMEMO2, as defined by [XEP-0384 `>= 0.8.0`](https://xmpp.org/extensions/xep-0384.html),
+which is still not supported by major XMPP clients, such as
+[Dino](https://dino.im), [Gajim](https://gajim.org/support/extensions/) or
+[Conversations](https://conversations.im).
+
+## Overview
+
 `xxcc` is a simple XMPP client written in C++, using the Qt5 framework,
 as well as a few other dependencies also based in Qt5. As opposed to
 other existing XMPP clients, `xxcc` is designed with touch-enabled