Re: [w3c/manifest] Please add caption property to screenshots (#773)

@dominickng We are not currently using it in Edge though, as @jgw96 said, we are experimenting with them in the context of Edge. We are actively using the key in the Microsoft Store. Other PWA "app stores" are also including screenshots as well (e.g., [AppScope](https://appsco.pe/), [PWA Store](https://www.pwastore.com), etc.). This seems like an area that is still growing and being explored. As evidenced by @SpeednetGroup’s comment, many devs don’t know it exists—perhaps because [the Google docs](https://developers.google.com/web/fundamentals/web-app-manifest/) don’t include it?—and I suspect as PWAs show up in more traditional "app stores" this key will become more valuable.

For context of how we are using `screenshots` in the Microsoft Store, I cover that in a few of my PWA talks. Here’s [one reference I was able to find quickly, from May of 2017](https://www.aaron-gustafson.com/notebook/progressive-web-apps-and-the-windows-ecosystem/):

> Regardless, whether they got their by passive ingestion or my manual submission, the Web App Manifest will provide the basic set of information used for the app in the Store: name, description, icons, and screenshots. We’re also actively working with others in the W3C to introduce support for app categories and IARC ratings.

To @SpeednetGroup’s original point, I agree that a `description` (or similar key) would be a beneficial addition in this context, for both sighted and non-sighted users.

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