One way translation

[erikakettleson-openai]

Summary

Adding a new cookbook for using the Realtime API to create a one-way translation application as well as the associated code repository of the app.

Motivation

This is the first commit and the repo allows users to run the code locally.

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[msingh-openai]

Minor nit - the steps have inconsistent ### tags e.g., ### Step 1, vs ## Step 5

[msingh-openai]

Approved

[Nazareka]

@erikakettleson-openai @msingh-openai There is no "lib" folder in src and relay-server folders, so it doesn't work :(