Add README file

README.md

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+
+This repository contains configuration files for building a 
+Docker (http://docker.io) image for the Subsonic media streamer.
+
+## Noteworthy
+
+* Subsonic 5.2 (http://www.subsonic.org)
+
+## Build your own image
+
+```shell
+$ docker build -t <your-name>/docker-subsonic .
+```
+
+## Get a pre-built image
+
+A current image is available as a trusted build from the Docker index:
+
+```shell
+$ docker pull  cyrilix/docker-subsonic
+```
+
+The repository page is at
+https://index.docker.io/u/cyrilix/docker-subsonic/
+
+
+## Run a container with this image
+
+```shell
+$ docker run \
+  --detach \
+  --publish 8080:8080 \
+  --volume "/wherever/your/music/is:/opt/music/:ro" \
+  <your-name>/subsonic
+
+```