Add it in a prominent place: Right after figuring out what QEMU is,
users may wish to know how to use it more than they want to know how to
build their own version of it.

Signed-off-by: John Snow <jsnow@redhat.com>
Message-Id: <20201104193032.1319248-1-jsnow@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>