Update README with additional metadata.

README.md

@@ -1,3 +1,33 @@
 ---
 license: cc-by-4.0
+tags:
+- audio
+task_categories:
+- audio-classification
 ---
+
+# AudioSet data
+This repository contains the balanced training set and evaluation set
+of the [AudioSet data](
+https://research.google.com/audioset/dataset/index.html). The YouTube
+videos were downloaded in March 2023, and so not all of the original
+audios are available.
+
+Extracting the `*.tar` files will place audio clips into the `audio/`
+directory. The distribuion of audio clips is as follows:
+- `audio/bal_train`: 18685 audio clips out of 22160 originally.
+- `audio/eval`: 17142 audio clips out of 20371 originally.
+
+Most audio is sampled at 48 kHz 24 bit, but about 10% is sampled at
+44.1 kHz 24 bit. Audio files are stored in the FLAC format.
+
+## Citation
+```bibtex
+@inproceedings{45857,
+	title	= {Audio Set: An ontology and human-labeled dataset for audio events},
+	author	= {Jort F. Gemmeke and Daniel P. W. Ellis and Dylan Freedman and Aren Jansen and Wade Lawrence and R. Channing Moore and Manoj Plakal and Marvin Ritter},
+	year	= {2017},
+	booktitle	= {Proc. IEEE ICASSP 2017},
+	address	= {New Orleans, LA}
+}
+```