To-do-list

Hi, First of all, thanks for the work. Its a really cool package.

I was wondering if there is a better solution where we can build a package to let users make a method/class chainable by simply adding adecorator to it?
```
@chain
class Container {
//...
}
```
Do you think there is a better solution to implement widget chain?

Second, it seems like we would need to add more wrappers to common widgets.
Is there any to-do list so that people can contribute to the project?

If thats the case, it will be greatly helpful if you could write a step-by-step tutorial on how to add a wrapper for widgets for this project.

No files, tests, or entry points are named. Review the repository's existing widget-chain API first, then clarify whether the goal is decorator-based chaining, additional widget wrappers, a contribution to-do list, or a tutorial; completion is not defined in the issue.

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