Add CHANGELOG.md and update CONTRIBUTING.md #3

	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: Check CHANGELOG.md
	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 [[ ${ALL_CHANGED_FILES[*]} =~ (^\|[[:space:]])"CHANGELOG.md"($\|[[:space:]]) ]];
	then
	echo "CHANGELOG.md was modified.";
	exit 0;
	else
	echo "CHANGELOG.md was not modified.";
	echo "Please see CHANGELOG.md and follow the instructions to add your changes to that file."
	echo "In some rare scenarios, a changelog entry is not required and this CI check can be ignored."
	exit 1;
	fi

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