doc: add progress hook in README.md example (#1826)

README.md

@@ -18,6 +18,8 @@ Consider switching to [pyannoteAI](https://www.pyannote.ai) for better and faste
 
 ```python
 from pyannote.audio import Pipeline
+from pyannote.audio.pipelines.utils.hook import ProgressHook
+
 pipeline = Pipeline.from_pretrained(
     "pyannote/speaker-diarization-3.1",
     token="HUGGINGFACE_ACCESS_TOKEN_GOES_HERE")
@@ -26,8 +28,9 @@ pipeline = Pipeline.from_pretrained(
 import torch
 pipeline.to(torch.device("cuda"))
 
-# apply pretrained pipeline
-diarization = pipeline("audio.wav")
+# apply pretrained pipeline (with optional progress hook)
+with ProgressHook() as hook:
+    diarization = pipeline("audio.wav", hook=hook)
 
 # print the result
 for turn, _, speaker in diarization.itertracks(yield_label=True):