add openai and speech use case code

[amberz]

Purpose

• Add a new use case about AI Powered multi-language Virtual assistant
  This end-to-end solution uses Azure Speech and Azure OpenAI services to that could be used in real-time virtual assistant, it also adds multiple languages functions.

Does this introduce a breaking change?

[ ] Yes
[x ] No

Pull Request Type

What kind of change does this Pull Request introduce?
Add a new use case about AI Powered multi-language Virtual assistant.

[ ] Bugfix
[x ] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Documentation content changes
[ ] Other... Please describe:

How to Test

• Get the code

git clone [[repo-address]](https://github.com/amberz/Azure-Data-Services-Practices.git)
cd [repo-name] Azure-Data-Services-Practices
git checkout [branch-name] main
npm install

• Test the code

What to Check

Verify that the following are valid
*The code will show " Azure OpenAI is listening. Say 'Stop' or press Ctrl-Z to end the conversation.
Recognized speech: ...."

Other Information

[amberz]

Please help to review.

[amberz]

@mishrapratyush , @nawanas , @vivekchettiar, would you help to review the PR?