Describing how to represent breaks

_episodes/08-coffee.md

+---
+layout: break
+title: "Coffee Break"
+break: 15
+---
+
+Use the `break` layout for placeholder episodes representing coffee breaks and lunches.
+These episodes do *not* have exercises, questions, objectives, or keypoints in their metadata,
+but *must* have a "break" field to show how long the break is (in minutes).