Add README to demo supplier

Author: malte-hansen

demo-supplier/README.md

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+## Description
+
+Service that replaces the backend of ExplorViz and provides static data for software landscapes.
+
+## Installation
+
+- `npm install`
+
+## Running / Development
+
+- Start application: `npm run start`
+
+## Docker
+
+- You may also use the supplied Dockerfile to build the Docker Image.
+- An exemplary Docker Compose file is part of this package.