Add VSConfig file

[cartermp]

Fixes #6581

This should allow someone to open VisualFSharp.sln in VS without knowing exactly what to install and be prompted by VS to install the correct components.

See this blog post for more info: https://devblogs.microsoft.com/setup/configure-visual-studio-across-your-organization-with-vsconfig/

[saul]

This is a great step for first time contributors. Is this as minimal as possible? I see e.g. TypeScript and Docker in there, chose (and any others) be removed if they’re not necessary?

[cartermp]

Mea culpa, included some other stuff I installed.

[cartermp]

Note - yes, this is technically required

[cartermp]

Yes, this is technically required - legacy .NET projects take a dependency on this for the property pages

[cartermp]

Command failed to execute with exit code 1: C:\Users\VssAdministrator\.nuget\packages\StrawberryPerl64\5.22.2.1\Tools\perl\bin\perl.exe "D:\a\1\s\tests\fsharpqa\testenv\bin\runall.pl" -resultsroot "D:\a\1\s\artifacts\TestResults\Release" -results test-net40-fsharpqa-results.log -log test-net40-fsharpqa-errors.log -fail test-net40-fsharpqa-errors -cleanup:no -procs:2
System.Management.Automation.RuntimeException: Command failed to execute with exit code 1: C:\Users\VssAdministrator\.nuget\packages\StrawberryPerl64\5.22.2.1\Tools\perl\bin\perl.exe "D:\a\1\s\tests\fsharpqa\testenv\bin\runall.pl" -resultsroot "D:\a\1\s\artifacts\TestResults\Release" -results test-net40-fsharpqa-results.log -log test-net40-fsharpqa-errors.log -fail test-net40-fsharpqa-errors -cleanup:no -procs:2
at Exec-CommandCore, D:\a\1\s\eng\build-utils.ps1: line 50
at Exec-Console, D:\a\1\s\eng\build-utils.ps1: line 119
at <ScriptBlock>, D:\a\1\s\eng\Build.ps1: line 279

cc @brettfo @KevinRansom

[cartermp]

Yay flaky CI. Let's get this in before the machines get angry at me!