Porting fixes/pairs/computes/... to KOKKOS

Hi all,

I was wondering if there are any guidelines for (or if it is at all
recommended at this point to) porting fixes/pair styles/computes to
KOKKOS. If it is relatively simple I can imagine that a short guide or
something on it would be very helpful, as then people can follow this
guide to port functionality to KOKKOS on an as-needed/as-wanted basis
and share back with the rest.