add JSON file + Python script to keep track of software licenses #1

	# documentation: https://help.github.com/en/articles/workflow-syntax-for-github-actions
	name: Test software licenses
	on: [push, pull_request]
	permissions:
	contents: read # to fetch code (actions/checkout)
	jobs:
	build:
	runs-on: ubuntu-20.04
	steps:
	- name: Check out software-layer repository
	uses: actions/checkout@93ea575cb5d8a053eaa0ac8fa3b40d7e05a33cc8 # v3.1.0

	- name: set up Python
	uses: actions/setup-python@13ae5bb136fac2878aff31522b9efb785519f984 # v4.3.0
	with:
	python-version: '3.9'

	- name: Check software licenses
	run: \|
	python licenses/spdx.py licenses/licenses.json

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