Add a command for whisper quantization (#1422)

      Co-authored-by: Alexander Kozlov <[email protected]>

README.md

@@ -331,10 +331,14 @@ For more examples check out our [Generative AI workflow](https://docs.openvino.a
 
 NOTE: Whisper Pipeline requires preprocessing of audio input (to adjust sampling rate and normalize)
  
- ### Converting and compressing image generation model from Hugging Face library
+ ### Converting and quantizing speech-to-text model from Hugging Face library
 ```sh
 #Download and convert to OpenVINO whisper-base model
 optimum-cli export openvino --trust-remote-code --model openai/whisper-base whisper-base
+
+#Download, convert and apply int8 static quantization to whisper-base model
+optimum-cli export openvino --trust-remote-code --model openai/whisper-base \
+--quant-mode int8 --dataset librispeech --num-samples 32 whisper-base-int8
 ```
 
 ### Run generation using Whisper Pipeline API in Python