Make general reviewer guidelines

[alexarje]

The need for reviewer guidelines was brought up in a forum discussion.

@cpmpercussion suggested this article as a good starting point.

It would be good to come up with some general guidelines for all categories, possibly followed up by more specific guidelines for each submission category (paper, music, installations).

[isabelacorintha]

This article provides much food for thought, excellent as a starting point for the discussion .