dev(narugo): add unittest and docs

import os.path

from natsort import natsorted

from imgutils.metrics import laplacian_score

from plot import image_plot

if __name__ == '__main__':

    items = []

    for filename in os.listdir('laplacian'):

    for filename in natsorted(os.listdir('laplacian')):

        image = os.path.join('laplacian', filename)

        ls = laplacian_score(image)

        display_name = f'{filename}\nScore: {ls:.3f}'