README does not explain where and how states are defined

[tvogt]

Neither the example nor other text ever says where variables like offTheHook come from and what type they need to be. The example should be complete, including definitions.

[qmuntal]

The README can't contain all the definitions, else it would become unreadable. Please take a look at the runnable examples in https://github.com/qmuntal/stateless/blob/master/example_test.go, there you have everything you need (I hope).