Add an upstream metadata file in the packaging.

debian/changelog

@@ -3,6 +3,7 @@ lxqt-notificationd (1.4.0-0ubuntu1) UNRELEASED; urgency=medium
   * New upstream release.
   * Bump build dependencies.
   * Fix outdated Lintian override formatting.
+  * Add an upstream metadata file in the packaging.
 
  -- Simon Quigley <tsimonq2@ubuntu.com>  Sun, 12 Nov 2023 18:17:36 -0600
 

debian/upstream/metadata

@@ -0,0 +1,5 @@
+Bug-Database: https://github.com/lxqt/lxqt-notificationd/issues
+Bug-Submit: https://github.com/lxqt/lxqt-notificationd/issues/new
+Changelog: https://github.com/lxqt/lxqt-notificationd/blob/master/CHANGELOG
+Repository: https://github.com/lxqt/lxqt-notificationd.git
+Repository-Browse: https://github.com/lxqt/lxqt-notificationd