feat(radio): add radio custom example

[richbachman]

This adds a custom radio example to the docs.

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Latest commit: 76baa73

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[richbachman]

@diegohaz I know this is an older PR, but any chance I can get a review for it? Thanks!

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.