members: Add Xaver Hugl as a KWin point-of-contact

Xaver is a KWin maintainer.

Signed-off-by: Vlad Zahorodnii <vlad.zahorodnii@kde.org>

MEMBERS.md

@@ -3,7 +3,8 @@
 - GTK/Mutter: Jonas Ådahl <jadahl@gmail.com> (@jadahl),
   Carlos Garnacho <carlosg@gnome.org> (@carlosg)
 - KWin: Vlad Zahorodnii <vlad.zahorodnii@kde.org> (@zzag),
-  David Edmundson <david@davidedmundson.co.uk> (@davidedmundson)
+  David Edmundson <david@davidedmundson.co.uk> (@davidedmundson),
+  Xaver Hugl <xaver.hugl@kde.org> (@Zamundaaa)
 - mesa: Daniel Stone <daniel@fooishbar.org> (@daniels),
   Mike Blumenkrantz <michael.blumenkrantz@gmail.com> (@zmike)
 - Mir: Christopher James Halse Rogers <raof@ubuntu.com> (@RAOF),