Add basic cmake build instructions. Rework of the README file. Delete files INDEX and Mainpage.dox. Add a warning if the rdiff-backup backend is not found on the system. Some cosmetics. Signed-off-by: gregory guy <gregory-tde@laposte.net>
git-svn-id: svn://anonsvn.kde.org/home/kde/branches/trinity/applications/keep@1088044 283d02a7-25f6-0310-bc7c-ecb5cbfe19da