cue: add another example
cue: add another example

Change-Id: I5a3fb5ab471cd0ada6382e63085865bea9145be3
Reviewed-on: https://cue-review.googlesource.com/c/cue/+/2877
Reviewed-by: Marcel van Lohuizen <a22d082192f3ccf984644a4f482781f4c2d65180@golang.org>

cuelang/cue