Including review data in AppStream

[Richard Hughes]

Hey,

For GNOME 3.20 we're using the xdg-app-review site for anonymous
ratings and reviews, but this isn't going to be suitable for
enterprise distros like RHEL. For RHEL we'd want to ship canned review
data, i.e. that had been checked and moderated ahead of time.

One way of doing this is to just ship a custom JSON file but a more
standards compliant way would be to ship the review data in the
AppStream format instead. If anyone else thinks this is a good idea I
can work on a proposal for new API.

Richard