serialisation techniques in readme

[ccouzens]

Hey,

I'd like to add some examples of how typeshare might be used to the Readme.

For example having common schemas for parsing JSON.

I'd like to add this because IMO the repeated mention of FFI (without additional qualifications) makes me think it's for calling into c libraries.

I'd like more examples than just JSON.

What other serialisation techniques might someone use with typeshare?