Generate docs for NExtends' API

[GMouron]

Currently, the only way to know everything present in NExtends is to look at the code.
It would be nice to have a nice, automatically generated doc available

[nfaugout-lucca]

Which tool do you suggest ?

[GMouron]

https://dotnet.github.io/docfx/
This is what is used by the new documentation of .NET Core

[nfaugout-lucca]

Sounds good, thanks !

[nfaugout-lucca]

In progress : https://github.com/LuccaSA/NExtends/tree/Add.Docs