Add labs/context playground examples

[AndrewJakubowicz]

For graduation we want some labs/context playground examples.

[quincarter]

I have a whole article showcasing context. If you'd like to use any of it then please do! I'd appreciate the call out if you do end up using it 😉

https://medium.com/@quincarter/understanding-component-state-and-using-lit-element-context-40981e808535

TLDR there's a codepen at the end with the entire code. But I go into quite a few nested children and really show off the power of passing the context without prop drilling.

I can also try to share an example passing the instance of a class around the tree. It's in a work project but I could make an example.

[AndrewJakubowicz]

Thank you for writing that!

[AndrewJakubowicz]

Closing this as there is at least 1 example now.