Absorb Accord.net as a whole or in parts

[Accord.net](https://github.com/accord-net/framework), (An ML library for .net), has been archived, and will no longer be maintained. The maintainer has done so partly because of ML.net deprecating Accord as a ML framework for .net. (and apparently also because of nasty researchers making fun of people using C# for Machine Learning)

The ML.net -team should absorb it, (fork it into dotnet, and move the components piece-by-piece into ML.net), because there are a lot of great stuff there that could really benefit ML.net's future, that now is just adrift, without new releases or active development.

It would be a shame for it all to go to "waste" or fall into obscurity