[libnotify: 1/2] Add README clarifying status of libnotify

[Logan Rathbone <larathbone src gnome org>]

commit edb1dc8394e4543d7918ae6b518f0599eada7de4
Author: Maximiliano Sandoval R <msandova gnome org>
Date:   Mon Mar 14 17:50:55 2022 +0100

    Add README clarifying status of libnotify
    
    See discussions at https://gitlab.gnome.org/GNOME/libnotify/-/issues/20.
    
    Based off https://gitlab.gnome.org/GNOME/libnotify/-/merge_requests/19

 README.md | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)
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diff --git a/README.md b/README.md
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+# libnotify
+
+## Description
+
+libnotify is a library for sending desktop notifications to a notification
+daemon, as defined in the [org.freedesktop.Notifications][fdo-spec] Desktop
+Specification. These notifications can be used to inform the user about an event
+or display some form of information without getting in the user's way.
+
+## Notice
+
+For GLib based applications the [GNotification][gnotif] API should be used
+instead.
+
+[fdo-spec]: https://specifications.freedesktop.org/notification-spec/notification-spec-latest.html
+[gnotif]: https://docs.gtk.org/gio/class.Notification.html