Improve README documentation on how to use this crate

[learncodingforweb]

unable to know how to use package to do serialize and deserialize. provide example code or mention in docs. how to use it.

[ryan-summers]

I assume you're trying to say that it's not clear how to use this package? I agree that the docs don't really help. It would be useful to have a small example in the front-page source docs.