Add multi-component example to show how state can be shared

[Firstyear]

This adds a multi component example to demonstrate how state can be shared between components that may want to receive updates. I'm sure there could be better approaches and improvements to this, so I'd like to hear that feedback!

note: I wasn't able to use let onclick = self.dispatch.reduce_callback(|s| s.count += 1); because it wasn't work in latest chrome/edge, but it appears this also fails to trigger a callback right now in all examples of the project, so maybe there is currently a bug there?

[intendednull]

Looks great! Thanks for your interest. There was in fact a bug, all fixed now.

It might be helpful if we used DispatchProps for one of the components, so both methods are seen.

[Firstyear]

Hmmm that's a good idea but I'm still hazy on how dispatch props works tbh. I'm not confident I could actually do this successfully ^^;