Added F# starter solution based on .NET Core

fsharp-core/GildedRose.UnitTests/GildedRose.UnitTests.fsproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>netcoreapp2.1</TargetFramework>
+
+    <IsPackable>false</IsPackable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <Compile Include="Tests.fs" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.0.0" />
+    <PackageReference Include="Unquote" Version="4.0.0" />
+    <PackageReference Include="xunit" Version="2.4.1" />
+    <PackageReference Include="xunit.runner.visualstudio" Version="2.4.1">
+      <PrivateAssets>all</PrivateAssets>
+      <IncludeAssets>runtime; build; native; contentfiles; analyzers</IncludeAssets>
+    </PackageReference>
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\GildedRose\GildedRose.fsproj" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <PackageReference Update="FSharp.Core" Version="4.6.2" />
+  </ItemGroup>
+
+</Project>

fsharp-core/GildedRose.UnitTests/Tests.fs

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+module GildedRose.UnitTests
+
+open GildedRose
+open System.Collections.Generic
+open Xunit
+open Swensen.Unquote
+
+[<Fact>]
+let ``My test`` () =
+    let Items = new List<Item>()  
+    Items.Add({Name = "foo"; SellIn = 0; Quality = 0})
+    let app = new GildedRose(Items)
+    app.UpdateQuality()
+    test <@ "fixme" = Items.[0].Name @>