add info for zkok validator #49

	name: Check image

	on:
	pull_request:
	paths:
	- validators/assets/*/

	jobs:
	check-image-size:
	runs-on: ubuntu-latest
	steps:
	- name: Checkout code
	uses: actions/checkout@v2

	- name: Install ImageMagick
	run: sudo apt-get install -y imagemagick

	- name: Check image name
	run: \|
	for file in $(find validators/assets -type f -name "*"); do
	if [ "$(basename $file)" != "logo.png" ]; then
	echo "Image name is not logo.png"
	echo "The image that does not meet the requirements is $file"
	exit 1
	fi
	done

	- name: Check image size
	run: \|
	for file in $(find validators/assets -type f -name "*.png"); do
	width=$(identify -format "%w" $file)
	height=$(identify -format "%h" $file)
	if [ $width -gt 128 ] \|\| [ $height -gt 128 ]; then
	echo "Image size does not meet requirements"
	echo "The image that does not meet the requirements is $file"
	exit 1
	fi
	done

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