Add F# samples

[dsyme]

Variation on #32 to add F# samples after moving C# samples to "csharp" directory

Things to do:

• Depends on ML./NET containing Smoke test for F# machinelearning#600 and Allow use of property-based row classes in ML.NET machinelearning#616
• Make sure the samples run (some "force modules to load" additions may be needed)
• Consider using XPlot as it is more normal for F#
• Consider making available as F# scripts rather than just compiled code (these would run on .NET Framework). Adding a pivot "compiled" and "scripting" may make senses, I'm not sure.
• remove stuff that shouldn't be here like the change to nuget.config

[CESARDELATORRE]

Would it be possible to add the F# samples (this PR) to the branch "dotnet/machinelearning-samples" instead of MASTER branch? - Until F# is supported in the public release of ML.NET.

I'll add the Csharp changes about the folders first, to MASTER and to "dotnet/machinelearning-samples" branches, though.

[CESARDELATORRE]

Never mind, I just saw your email. Let's keep the PR against MASTER. But we'll need to wait for the merge to happen.

[dsyme]

@asthana86 @CESARDELATORRE This change is now much smaller now #35 is in, if you'd like to start reading the F#. Main points to note are

• Each Program.fs is written in top-to-bottom script form, e.g. like this.

• We may eventually change them to be "script.fsx" files but for now they are compiled, for now that's fine

• When reading the code, you start reading at the top and go through to the bottom just like a python script. Functions are defined before they get called.

• I've just used a single file for each example. F# people tend to put more in a file since definitions are generally more succinct.

• The data types are defined using member val. F# people would normally like to use records without any attributes and it still feels a little odd to use classes and attributes in F#. It would be nice to look at whether this can become simpler

• I think the plotting and CSV data access can be simplified, to use XPlot and FSharp.Data respectively, I'll look into that.

Good intro guides to F# are at https://fsharpforfunandprofit.com/

[ankitbko]

@dsyme Pretty sure I am not the person you intended to tag 😄

[dsyme]

@ankitbko - You're right, was after @asthana86 :)

[eerhardt]

This should be reverted. It is causing CI to fail.