AT:

• Milestone is added to the reference
• in the intro, an overview of all supported CMMN Constructs is shown, comparable to http://stage.docs.camunda.org/api-references/bpmn20/#overview-bpmn-20-overview-and-coverage
• there is a reference for case execution listeners
• there is a general introduction for the following:
• plan items vs plan item definitions
• entry and exit criteria

(of course not based on a CMMN renderer, just use images)