Adding DARE prompt to intro_prompt_design notebook

[AutoViML]

Hi: This pull request adds a short series of steps to the intro_prompt_design notebook to incorporate the DARE prompt through a simple example chatbot application. Please review and let me know if you need any changes. Thanks Ram

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[AutoViML]

Hi: Can you please review again? I have made the requested changes. Ram

[holtskinner]

@AutoViML Sorry for the delay on this. The repository has been refactored/restructured since this PR was made and the notebook you're editing has been moved