Chronos integrates with PlayMaker, the popular visual scripting plugin for Unity. The action scripts and example scene are under the Chronos/PlayMaker/ folder.
The actions will be categorized under Chronos for methods, and Physics [2d] (Chronos) for the equivalents of rigidbody methods.
There is no specific tutorial or documentation for PlayMaker actions as they follow the same naming conventions as regular Chronos methods. The help icon on each action is linked to the documentation page for each method.