Cheat Sheets are XML documents that can be interpreted by the Eclipse Cheat Sheet framework to provide user assistance. For example, when developing design patterns, you can include a cheat sheet to describe the resources added to a workspace, and to assist users with any manual steps required after a design pattern is applied. Cheat sheets are not mandatory for design patterns, but recommended.
You can edit cheat sheets using any XML editor. Eclipse provides a Cheat Sheet editor that facilitates cheat sheet development.
For information about creating and developing cheat sheets, see "Building Cheat Sheets in Eclipse" on the Oracle Technology Network:
http://www.oracle.com/technetwork/articles/entarch/eclipse-cheat-sheets-092351.html