Add guide entry to `README.md`. #1

	name: Test GraalJS Maven Webpack Guide
	on:
	push:
	paths:
	- 'graaljs/graaljs-maven-webpack-guide/**'
	- '.github/workflows/graaljs-maven-webpack-guide.yml'
	pull_request:
	paths:
	- 'graaljs/graaljs-maven-webpack-guide/**'
	- '.github/workflows/graaljs-maven-webpack-guide.yml'
	workflow_dispatch:
	permissions:
	contents: read
	jobs:
	run:
	name: 'graaljs-maven-webpack-guide'
	runs-on: ubuntu-latest
	timeout-minutes: 15
	steps:
	- uses: actions/checkout@v4
	- uses: graalvm/setup-graalvm@v1
	with:
	java-version: '23.0.0'
	distribution: 'graalvm'
	github-token: ${{ secrets.GITHUB_TOKEN }}
	cache: 'maven'
	- name: Build and run 'graaljs-maven-webpack-guide'
	run: \|
	cd graaljs/graaljs-maven-webpack-guide
	./mvnw --no-transfer-progress test
	./mvnw --no-transfer-progress exec:java -Dexec.mainClass=com.example.App -Dexec.args="https://www.graalvm.org/javascript"

Provide feedback