Documentation on how to create cloud images

[Alexey Torkhov]

Hi.

It would be great if there was some kind of README in cloud-kickstarts
git repo and/or wiki & Cloud Guide that has some docs on how to create
cloud image.

I've tried to build it myself with livemedia-creator and got "Only url
install method is currently supported. Please fix your kickstart
file." error.

Other thing is that cloud-kickstarts should probably be packaged or
merged with spin-kickstarts.

Alexey