Add audio path to README

README.md

@@ -29,6 +29,7 @@ Each video is represented as a JSON object with the following fields:
 | `targets`    | The target segmentation as string of binary values (e.g., `000100000010`).              |
 | `channel_id` | The YouTube channel ID which this video belongs to.          |
 | `video_id`   | The YouTube video ID.            |
+| `audio_path` | Path to the .mp3 file of the video            |
 
 | Partition  | # Examples    |
 |------------|--------------|