add: ProductSum recursion algorithm implementation #4

	# This GitHub Action updates the DIRECTORY.md file (if needed) when doing a git push
	name: Update Directory

	on:
	push:
	branches-ignore: "master"

	jobs:
	updateDirectory:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v4

	- uses: actions/setup-node@v3
	with:
	node-version: 20
	cache: npm

	- name: 📦 Install dependencies
	run: npm ci

	- name: 🗄️ Create Directory from JS files
	run: node .github/workflows/UpdateDirectory.js

	- name: Configure Github Action
	run: \|
	git config --global user.name github-actions
	git config --global user.email '${GITHUB_ACTOR_ID}+${GITHUB_ACTOR}@users.noreply.github.com'

	- name: 🤓 Commit & push new Directory (if needed)
	run: \|
	if [[ `git status --porcelain` ]]; then
	git commit -am "Updated Documentation in DIRECTORY.md"
	git push
	else
	echo "NO CHANGES DETECTED"
	fi

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