[libnotify] libnotify.doap: Add missing description field

[Marco Trevisan <marcotrevi src gnome org>]

commit ecb1d4ec08874e76f8800052271667fefbf4e346
Author: Marco Trevisan (Treviño) <mail 3v1n0 net>
Date:   Wed May 4 16:22:05 2022 +0200

    libnotify.doap: Add missing description field

 libnotify.doap | 3 +++
 1 file changed, 3 insertions(+)
---
diff --git a/libnotify.doap b/libnotify.doap
index 6655bd4..12d95f8 100644
--- a/libnotify.doap
+++ b/libnotify.doap
@@ -8,6 +8,9 @@
   <category rdf:resource="http://api.gnome.org/doap-extensions#core"; />
   <programming-language>C</programming-language>
   <shortdesc xml:lang="en">libnotify is a library for sending desktop notifications</shortdesc>
+  <description>Library to send desktop notifications that follows the FDO
+specifications:
+  https://gitlab.freedesktop.org/xdg/xdg-specs/-/blob/master/notification/notification-spec.xml</description>
   <maintainer>
     <foaf:Person>
       <foaf:name>Christian Hammond</foaf:name>