Let's add some details about VM templating, focusing on the VM memory
configuration only.

There is much more to VM templating (VM state? block devices?), but I leave
that as future work.

Message-ID: <20230906120503.359863-10-david@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: David Hildenbrand <david@redhat.com>