Add model card (README)

README.md

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+---
+license: mit
+tags:
+  - audio
+  - speaker-diarization
+  - onnx
+  - pyannote
+---
+
+# segmentation-3.0 ONNX
+
+ONNX export of [pyannote/segmentation-3.0](https://huggingface.co/pyannote/segmentation-3.0) for speaker diarization (voice activity and speaker segmentation).
+
+- **Input**: waveform `[batch, channels, samples]`, 16 kHz mono, e.g. `[1, 1, 160000]` for 10 seconds.
+- **Output**: logits `[batch, num_frames, num_classes]` (7 classes, powerset decoding).
+- Exported with opset 14. Use ONNX Runtime to run on device (Core ML conversion is not supported for this model due to control-flow ops).
+
+Derived from pyannote.audio; see [pyannote/segmentation-3.0](https://huggingface.co/pyannote/segmentation-3.0) for the original model and license.