Add CHANGELOG.md and update CONTRIBUTING.md #1

	name: CI

	on:
	pull_request:
	branches:
	- develop

	jobs:
	# ------------------------------------------------------------------------------------------------------------------------------------------------
	# Event `pull_request`: Compare the last commit of the main branch or last remote commit of the PR branch -> to the current commit of a PR branch.
	# ------------------------------------------------------------------------------------------------------------------------------------------------
	changed_files:
	runs-on: ubuntu-latest
	name: Test changed-files
	steps:
	- uses: actions/checkout@v4

	# -----------------------------------------------------------------------------------------------------------
	# Example 1
	# -----------------------------------------------------------------------------------------------------------
	- name: changelog modified
	id: changelog-modified
	uses: tj-actions/changed-files@v42
	with:
	files: CHANGELOG.md

	- name: List all changed files
	env:
	ALL_CHANGED_FILES: ${{ steps.changelog-modified.outputs.all_changed_files }}
	run: \|
	if "CHANGELOG.md" not in ${ALL_CHANGED_FILES}:
	echo "CHANGELOG.md was not modified"
	exit 1
	else:
	exit 0

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