updating the README

Dockerfile

@@ -23,8 +23,8 @@ RUN apk add --no-cache \
 
 USER mpv
 
-WORKDIR /home/mpv
+WORKDIR /home/mpv/media
 
 VOLUME ["/home/mpv/media"]
 
-CMD ["mpv"]
+CMD ["ash"]

README.md

@@ -1,13 +1,18 @@
-# mpv
+# How to use this image
+
+## Start an MPV instance
 
 ```sh
-docker run --rm \
+docker run --rm -i -t \
     --device /dev/dri \
     --network host \
     --shm-size 2g \
     -e DISPLAY=$DISPLAY \
     -v /etc/machine-id:/etc/machine-id:ro \
     -v /run/user/1000/pulse:/run/user/1000/pulse \
     -v $HOME/.Xauthority:/home/mpv/.Xauthority \
+    -v /path/to/your/media/:/home/mpv/media:ro \
     mpv
 ```
+
+where `/path/to/your/media` is the directory of the media files that you want to play.