[w3c/manifest] Add id member to manifest (#988)

Closes #586 

Still work in progress
This change (choose at least one, delete ones that don't apply):


* Adds new normative recommendations or optional items

Implementation commitment (delete if not making normative changes):

* [ ] WebKit (https://bugs.webkit.org)
* [x ] Chromium (https://bugs.chromium.org/1182363)
* [ ] Gecko (http://bugzilla.mozilla.org)

If change is normative, and it adds or changes a member:

* [ ] [updated JSON schema](https://github.com/SchemaStore/schemastore/blob/master/src/schemas/json/web-manifest.json)

Commit message:

(Fill in. If making normative changes, describe exactly what the behavioral
difference will be.)

Person merging, please make sure that commits are squashed with one of the following as a commit message prefix:

* chore:
* editorial:
* BREAKING CHANGE:
* And use none if it's a normative change


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You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/manifest/pull/988

-- Commit Summary --

  * Add id member
  * add example
  * Add more description

-- File Changes --

    M index.html (53)

-- Patch Links --

https://github.com/w3c/manifest/pull/988.patch
https://github.com/w3c/manifest/pull/988.diff

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