default.xml: adding pointer to IRC channel

Signed-off-by: Davide Ricci davide.ricci@huawei.com

manifests/default.xml

@@ -12,7 +12,8 @@ SPDX-FileCopyrightText: Huawei Inc.
 
 		Check out Oniro Project documentation at https://docs.oniroproject.org
 
-		Meet the developers on mattermost at https://chat.booting.oniroproject.org/
+		Meet the developers on mattermost at https://chat.booting.oniroproject.org/ or
+		point your favorite IRC client to the #oniro channel on https://libera.chat
 
 	</notice>