Support for F# files

[data-miner00]

Feature/BugFix

I have tested the program file with .fs extension and script file with .fsx extension in Visual Studio 2017 but it
displays unrecognized files when I am editing both type of files instead of showing the F# logo.

[1thenikita]

Okay, I'll take a note and see how VS 2017 behaves when recognizing files.

Sorry for the long answer 😥