Add Fleece serialization template/example?

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Stemming from https://github.com/jet/equinox/issues/57, the concern of demonstrating and/or providing a starting point for implementing serialization using something other than the first-among-equals (but some are more equal than others) convention-based-encoding system may best be represented by including a template and/or template option.

• Name suggestion, perhaps equinoxFleece ?
• Perhaps a simple gist might suffice (in the interim?)

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In general, FsCodec.Codec.Create(encode,tryDecode) provides all you need. The general pattern of slotting in a FsCodec,X has been established if anyone ends up using a scheme other than FsCodec.NewtonsoftJson and the (not-yet-implemented) FsCodec.SystemTextJson.

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Closing - lots of analysis and discussion has concluded that the present interface afford the control needed to use FSharp.Data if desired and no further action is thus necessary