Added F# starter solution based on .NET Core

fsharp-core/GildedRose.UnitTests/Tests.fs

@@ -0,0 +1,14 @@
+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 @>