Update Readme

README.md

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 # TileBoard Docker-Container
+
 [![Build Status](https://cd.f-brinker.de/api/badges/fbrinker/docker-tileboard/status.svg)](https://cd.f-brinker.de/fbrinker/docker-tileboard)
+
+This is a very basic Docker container for [TileBoard](https://github.com/resoai/TileBoard), "a simple yet highly configurable Dashboard for HomeAssistant".
+
+It contains the sources and starts a simple Python3 webserver to serve TileBoard at port 8000.
+
+## Usage
+
+You have to mount your `config.js` file into the `/tileboard` directory of the Docker container.
+
+## Example
+
+Here is an example, using Docker-Compose:
+
+```yaml
+version: '3'
+services:
+
+  tileboard:
+    image: fbrinker/tileboard
+    volumes:
+      - ./config.js:/tileboard/config.js
+    ports:
+      - "8234:8000"
+```
+
+After a `docker-compose up -d`, you can reach your TileBoard instance under `http://[yourhost-or-ip]:8234`.
+
+## Sources
+
+Have a look at the [Git-Repository](https://git.f-brinker.de/fbrinker/docker-tileboard).