[Arm-dev] Using zram-swap

I have very recently learned about zram-swap.  Fedora-29-arm is using 
it.  It supposedly makes a considerable difference even over HD swap.

Since many (potential) users of Centos-arm do not have a ready HD, 
perhaps we can switch the image from a physical partition to zram? Or at 
least instructions to change to this on the wiki.

Perhaps target the 7.6 image?   (is there any information as to when 7.6 
may be available?)

thanks