Added minimal Readme which points to SBuild's homepage.


git-svn-id: http://sbuild.tototec.de/svn/sbuild/trunk@326 024a02f7-42f7-40fc-9f58-65666d1f2450
Moved README in top level directory.


git-svn-id: http://sbuild.tototec.de/svn/sbuild/trunk@327 024a02f7-42f7-40fc-9f58-65666d1f2450