add AudioQnA readme with supported model (#689)

* add readme with supported model

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* add explaination

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AudioQnA/README.md

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+# AudioQnA Application
+
+AudioQnA is an example that demonstrates the integration of Generative AI (GenAI) models for performing question-answering (QnA) on audio files, with the added functionality of Text-to-Speech (TTS) for generating spoken responses. The example showcases how to convert audio input to text using Automatic Speech Recognition (ASR), generate answers to user queries using a language model, and then convert those answers back to speech using Text-to-Speech (TTS).
+
+## Deploy AudioQnA Service
+
+The AudioQnA service can be deployed on either Intel Gaudi2 or Intel XEON Scalable Processor.
+
+### Deploy AudioQnA on Gaudi
+
+Refer to the [Gaudi Guide](./docker/gaudi/README.md) for instructions on deploying AudioQnA on Gaudi.
+
+### Deploy AudioQnA on Xeon
+
+Refer to the [Xeon Guide](./docker/xeon/README.md) for instructions on deploying AudioQnA on Xeon.
+
+## Supported Models
+
+### ASR
+
+The default model is [openai/whisper-small](https://huggingface.co/openai/whisper-small). It also supports all models in the Whisper family, such as `openai/whisper-large-v3`, `openai/whisper-medium`, `openai/whisper-base`, `openai/whisper-tiny`, etc.
+
+To replace the model, please edit the `compose.yaml` and add the `command` line to pass the name of the model you want to use:
+
+```yml
+services:
+  whisper-service:
+    ...
+    command: --model_name_or_path openai/whisper-tiny
+```
+
+### TTS
+
+The default model is [microsoft/SpeechT5](https://huggingface.co/microsoft/speecht5_tts). We currently do not support replacing the model. More models under the commercial license will be added in the future.