Examples!

Was playing around with this and found that I wanted to run most of the examples you had in the README. So, extracted them out and put a little explanatory note in the directory's own README.

Also noted that the buffered example was written was busted because of `FilterChain` not replying to `call` and trying to call `serve` on the app instead of `call`. Hope that fix was right, and happy to revise if not (or maybe should have been separate PR... let me know however you think about it).

Love seeing some real experimentation happening, and thank you for sharing the early thoughts in code! :heart: