Add example of dash deployment

[alhoo]

There's been an lingering issue with using Dash and Zappa producing 403, 404, and 500 errors, depending upon how the app file and Zappa JSON settings are written. It's difficult to deploy a Dash app with Zappa -- a major bummer, since the combination of Dash's slickness with Zappa's serverlessness is a killer peanut-butter-and-chocolate combo.

This commit contains a minimal example of a dash app to help users get started with deploying dash applications using Zappa.

Closes https://github.com/zappa/Zappa/issues/1082

Description

GitHub Issues