[w3c/manifest] [Explainer] Add very simple manifest example (#533)

Manifests with just name and icons are quite common.  

While it's definitely not as good as more detailed manifest, it's a step in the right direction of turning a web page into a web app.

Signed-off-by: Rob Dolin <robdolin@microsoft.com>
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/manifest/pull/533

-- Commit Summary --

  * [Explainer] Add very simple manifest example

-- File Changes --

    M explainer.md (14)

-- Patch Links --

https://github.com/w3c/manifest/pull/533.patch
https://github.com/w3c/manifest/pull/533.diff

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