add the 'Rockboxed' theme by Roan Horning, moddified to work with the wpsbuild script

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@12273 a1c6a512-1295-4272-9138-f99709370657
diff --git a/docs/CREDITS b/docs/CREDITS
index 1641511..a42a637 100644
--- a/docs/CREDITS
+++ b/docs/CREDITS
@@ -271,3 +271,4 @@
 Chris Dohan
 Takashi Obara
 Rene Peinthor
+Roan Horning