simple voice output idea . Update README.rst

[krupalvora]

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Fixes #<issue_number_goes_here> 🦕

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[busunkim96]

Hi @krupalvora,

Thanks for opening a PR. We prefer to not add code to the README, since it is untested and can fall out of date. If you are interested in showing this to folks a blog post may be more appropriate. You can also contribute a sample if the code demonstrates how to use this library google-cloud-speech.