[TRG 4.02] Add a section to your top level README.md file, that contains information about the used base image

[matbmoser]

Introduction

There needs to be a section in the top level from the main readme, describing the used base images.

What needs to be done?

• Include the reference to the image: nginxinc/nginx-unprivileged:stable-alpine
• Include the reference to the image: node:lts-alpine
• Include the reference to the image: eclipse-temurin:17-alpine

[matbmoser]

This is done here #82