OK its ready
how-to make simple krescue image xz
I have made test example how its must be
Next link to example scripts which generate proper image
PS: i think next time manjaro mantainers can make it - its must be very easy - and i can provide only redirect link for krescue to official manjaro images
PSS: if anybody have some questions welcome
PSSS: this instructions not only for manjaro its universal for any other linux and not only linux os 