readme.dialog: fixed typo and improved CLI section
readme.dialog: fixed typo and improved CLI section

Added info how to prompt command line interface.

Change-Id: I19922b07813604d97797eb8351351597b2c69e72
Signed-off-by: Lukas Bednar <3e272c0898d424cb610815d921e8b4cbc29badca@redhat.com>

alonbl/otopi,alonbl/otopi,alonbl/otopi