editorconfig support

https://github.com/Microsoft/visualfsharp/issues/2693#issuecomment-289200984
> The answer is simple as well: limited resources. While Visual F# is a Microsoft product most of the stuff in this area is done by the open source community. There is a lot happening around tooling at the moment and I assume someone will take care of formatting eventually. But right now it seems people's interests/priorities are at other (important) features. TBH there is very little hope that Microsoft will implement formatting, so our best shot is the community. You can be an active part here and help to make it happen. ;-)

#3542

@Pilchie, @sharwell is it possible to push a prototype of styling rules integration for F# so that community can pick up and add rules using some reference sample?

**As without styling and code analyzers F# will still miss critical team collaboration features.**