Update README

Signed-off-by: Jael Gu <mengjia.gu@zilliz.com>

README.md

@@ -20,7 +20,16 @@ Generate embeddings for the audio "test.wav".
 *Write a pipeline with explicit inputs/outputs name specifications:*
 
 ```python
+from towhee.dc2 import pipe, ops, DataCollection
 
+p = (
+    pipe.input('path')
+        .map('path', 'frame', ops.audio_decode.ffmpeg())
+        .map('frame', 'vecs', ops.audio_embedding.clmr())
+        .output('path', 'vecs')
+)
+
+DataCollection(p('./test.wav')).show()
 ```
 
 <img src="./result.png" width="800px"/>