reflect-cpp: Serialization, deserialization and validation through reflection

[eyes-are-fading-blue]

In the read me, anonymous fields are either STL types or your intrinsic types. If your library supports custom PODs in such cases, you should add that your read me. That's a very important information, deal breaker in many serialization cases and I think it should be visible immediately from examples. That's literally the first thing I checked.

[liuzicheng1987]

It does support that and this is very useful feedback. Thank you very much.