Re: [w3c/permissions] Editorial: add an introduction (PR #381)

@marcoscaceres commented on this pull request.

still working through this...just initial comment 

> +        Specifications may define web platform features as “powerful features”. That is to say, a
+        user trusts the browser to not allow sites to use the capabilities of these features that
+        may have privacy or security implications unless and until they have given express
+        permission, typically via browser UI.

```suggestion
        Specifications can define features that are explicitly identified as a [=powerful feature=]. 
        These features are said to be "powerful" in that they can have significant privacy,
        security, and performance implications. As such, users rely on user agents 
        to deny sites the ability to use these features until they have given express permission, and usually only granting this ability for a limited amount of time. Express permission to allow a site to use a powerful feature is generally given and controlled through browser UI, as illustrated below.
```

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