code lacks documentation

[seannybgoode]

This is a great package, but it's severely lacking in even the most basic level of documentation.

Yeah, the code is self-documenting for the standard use case, kind-of, but what about the non standard cases? What are the interval values? Can they be zero for single run background tasks? What's the timeout value? What should it be set to generally? Does it depend on the kind of task being run?

Don't make people dig through your code to understand how it works.