We should highlight a plugin as a good example to work with

In #1535 (closed), @sedubois writes:

• various users (such as myself) might have functional custom administrate fields in their own private systems but have no clue how to turn that into a gem (although I'm not a good example because I could just have forked the outdated one; but then what should I put on the wiki page? Keep the outdated one, replace with my own, keep both?);

Perhaps administrate-field-nested_has_many is a solution to this problem?

In addressing #1600 (closed), we could point to this as a good example to look at.