README: add pointer to new wiki page

Signed-off-by: Andrew Jones <drjones@redhat.com>
Message-Id: <1446769483-21586-6-git-send-email-drjones@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

README

+Welcome to kvm-unit-tests
+
+See http://www.linux-kvm.org/page/KVM-unit-tests for a high-level
+description of this project, as well as running tests and adding
+tests HOWTOs.
+
 This directory contains sources for a kvm test suite.
 
 To create the test images do