[w3c/manifest] Discoverability of metadata in web application manifest (#486)

A web app manifest contains metadata that search engines might be interested in. It also provides a way for metadata to describe a collection of web resources as a unit. Has there been any discussion of aligning some of the members with schema.org? 

Just for fun, here's the first example in the spec, modified so that Google can understand a fair amount of the metadata.

```json
{
 "@context": "http://schema.org/",
 "@type": "MobileApplication",
 "applicationCategory": "Game",
 "inLanguage": "en",
 "name": "Super Racer 2000",
 "description": "The ultimate futuristic racing game from the future!",
 "alternateName": "Racer2K",
 "image": [{
  "@type": "imageObject",
  "contentUrl": "icon/lowres.webp",
  "height": "64",
  "width": "64",
  "encodingFormat": "image/webp"
 }, {
  "@type": "imageObject",
  "contentUrl": "icon/lowres.png",
  "height": "64",
  "width": "64",
  "encodingFormat": "image/png"
 }, {
  "@type": "imageObject",
  "contentUrl": "icon/hd_hi",
  "height": "128",
  "width": "128"
 }],
 "scope": "/racer/",
 "start_url": "/racer/start.html",
 "display": "fullscreen",
 "orientation": "landscape",
 "theme_color": "aliceblue",
 "background_color": "red"
}

```

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