added tests and github ci/cd #1

	name: Python application test

	on:
	push:
	branches:
	- main
	pull_request:
	branches:
	- main

	jobs:
	build:

	runs-on: ubuntu-latest

	steps:
	- uses: actions/checkout@v2
	- name: Set up Python 3.8
	uses: actions/setup-python@v2
	with:
	python-version: 3.8
	- name: Install dependencies
	run: \|
	python -m pip install --upgrade pip
	pip install pillow
	- name: Run script
	run: python readme_thumbnails.py
	- name: Test with unittest
	run: python tests/test_readme_thumbnails.py

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