Adding code changes and current Readme updates summarization sample

[marlenezw]

I made the following changes:

• moved the readme to the root directory and added appropriate packages
• added code to make the example work with pre-recorded audio and new dagless flow
• edited the prompty to give results in bulleted form and mention reporter name (let me know if you want me to remove either change)
• adding outline for readme which I will be working on updating.

The current code is not yet updated with keyless auth because I've been getting errors today when trying to connect it. I'll try and again and update the code when it's working. This example should work.

[marlenezw]

I also see someone else has a PR for adding managed identity with speech services. I think once we merge mine we can merge those changes, but I should probably test that it works. @cassiebreviu

[marlenezw]

Merging my changes