Andrew Overton 112ea0d089 [Dialogs] Add additional theming screenshot to Dialogs docs
This PR adds a screenshot of a themed Dialog to the Dialogs README.

Closes https://github.com/material-components/material-components-ios/pull/9997

COPYBARA_INTEGRATE_REVIEW=https://github.com/material-components/material-components-ios/pull/9997 from andrewoverton:add-theming-screenshot 03da851b3a5bcd4f696ea9ab84fbc35c3abf2f59
PiperOrigin-RevId: 312322585
2020-05-19 11:53:17 -07:00
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2020-05-18 16:41:12 +00:00