provide tutorial and example of how to use custom url prompt

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#17 创建于 2020年10月22日 0 条评论 0 个 reaction 已指派 0 人在 GitHub 查看

documentation enhancement good first issue

描述

The icons prompt for a URL by launching a dialog and the dialog can be customized by passing a `urlSource` function that return `Future`

this functionality is added at #5 but it needs to be demonstrated in the example and shown in the `README.md` file

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