[libnotify] Revert "Revert "Merge branch 'readme' into 'master'""

[Marco Trevisan <marcotrevi src gnome org>]

commit 2accd4ceab25015b36d160b21b89d69ef0acb3f2
Author: Marco Trevisan (Treviño) <mail 3v1n0 net>
Date:   Thu Apr 21 18:51:13 2022 +0200

    Revert "Revert "Merge branch 'readme' into 'master'""
    
    This reverts commit 1ad46301071856663735812a4dd7c15e6f054fd4.
    
    As per: https://gitlab.gnome.org/GNOME/libnotify/-/commit/1ad46301#note_1434358

 README.md | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)
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diff --git a/README.md b/README.md
new file mode 100644
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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