Add module with CLI for fetching images using google images downloader

[monocongo]

Add a module with CLI for fetching images using the Google Images Download package. We can possibly create corresponding annotations using a pre-trained object detection model such as YOLOv3 etc. if the model has been trained to detect the class of object we're interested in annotating in the images. This script is one example of what can be used for this annotation step.

[monocongo]

manual process:

$ pip install google_images_download
$ googleimagesdownload -k shooter -pk 'shotgun,pistol,rifle' -f jpg -t photo -o . -n -nn