Moved old ant scripts to contrib

and updated a copyright note

Signed-off-by: Daniel Borchmann <daniel.borchmann@mailbox.tu-dresden.de>
Move content from overview.html to README

Signed-off-by: Daniel Borchmann <daniel.borchmann@mailbox.tu-dresden.de>
Converted HTML escape characters to their original

Signed-off-by: Daniel Borchmann <daniel.borchmann@mailbox.tu-dresden.de>