add wallpaper by JaneAndreas, set it default

pandora/skins/Default/wallpapers/README

@@ -6,4 +6,5 @@
 a.png		http://www.flickr.com/photos/libertinus/891434640/sizes/z/in/photostream/
 b.png		http://www.flickr.com/photos/hamed/281311122/sizes/z/in/photostream/
 c.png		http://www.flickr.com/photos/55948751@N00/3831916479/sizes/m/in/photostream/
-default.png	http://www.flickr.com/photos/theklan/1276710183/sizes/z/in/photostream/
+d.png		http://www.flickr.com/photos/theklan/1276710183/sizes/z/in/photostream/
+socratesg.png	http://en.qi-hardware.com/wiki/File:Socratesg.png

pandora/skins/Default/wallpapers/default.png

@@ -0,0 +1 @@
+socratesg.png