[yocto] Adding test files to an image

[jfabernathy]

Suppose I want to build the meta-intel/meta-sugarbay image and also 
include some video and audio files into the /home/root directory to 
facilitate testing of the video and audio players.

Can I include these files in a recipe somewhere?

Also, I know that I can increase the spare image size so these files can 
be copied in later with the IMAGE_OVERHEAD_FACTOR and 
IMAGE_ROOTFS_EXTRA_SPACE. But where do these statements go?

conf/local.conf???

Jim A