docs: add a toJson serialization example to the README - #28
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Shows toJson as parse's inverse in one schema: an aliased key written back, a Time re-emitted as unix seconds, and a transform inverted via back, plus the tryParse(toJson(v)) identity behind tryValidate. Output comment verified against an actual run.
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Adds a Serialization section right after the JSON Schema section, making an in/out pair. One three-field schema demonstrates everything that distinguishes
toJsonfromstd/json's%: the aliased field is written back under its JSON key, thetimestamp()field becomes unix seconds again, and the mutated Fahrenheit value is inverted through the transform'sbackto Celsius on the wire. Also states thetryValidate == tryParse(toJson(v))identity.Snippet and its output comment are verified by compiling and running the assembled code (including a
tryValidateround-trip check).