Add build hints to reademe

Signed-off-by: Jan Losinski <losinski@wh2.tu-dresden.de>
Add a scratch file for integration testing

Signed-off-by: Jan Losinski <losinski@wh2.tu-dresden.de>
Add string representation to GuestPair

Signed-off-by: Jan Losinski <losinski@wh2.tu-dresden.de>