Add .vsconfig

This is a visual studio dependency map.
It lists the components needed to be able to build the solution.
It can be fed to the VS installer to ensure that, at minimum, the listed components (and their dependencies) are installed, so nobody has to guess what's needed.

.vsconfig

@@ -0,0 +1,33 @@
+{
+  "version": "1.0",
+  "components": [
+    "Microsoft.VisualStudio.Component.DependencyValidation.Community",
+    "Microsoft.VisualStudio.Component.CoreEditor",
+    "Microsoft.VisualStudio.Workload.CoreEditor",
+    "Microsoft.Net.Component.4.8.SDK",
+    "Microsoft.Net.Component.4.7.2.TargetingPack",
+    "Microsoft.Net.ComponentGroup.DevelopmentPrerequisites",
+    "Microsoft.VisualStudio.Component.Roslyn.Compiler",
+    "Microsoft.Component.MSBuild",
+    "Microsoft.VisualStudio.Component.Roslyn.LanguageServices",
+    "Microsoft.VisualStudio.Component.TextTemplating",
+    "Microsoft.VisualStudio.Component.NuGet",
+    "Microsoft.VisualStudio.Component.ManagedDesktop.Core",
+    "Microsoft.NetCore.Component.Runtime.8.0",
+    "Microsoft.NetCore.Component.SDK",
+    "Microsoft.VisualStudio.Component.FSharp",
+    "Microsoft.NetCore.Component.DevelopmentTools",
+    "Microsoft.VisualStudio.Component.AppInsights.Tools",
+    "Microsoft.VisualStudio.Component.Debugger.JustInTime",
+    "Microsoft.Net.Component.4.6.2.TargetingPack",
+    "Microsoft.Net.Component.4.8.1.TargetingPack",
+    "Microsoft.VisualStudio.Component.ManagedDesktop.Prerequisites",
+    "Microsoft.VisualStudio.Component.NuGet.BuildTools",
+    "Microsoft.Net.Component.4.6.TargetingPack",
+    "Microsoft.VisualStudio.Component.VSSDK",
+    "Microsoft.VisualStudio.ComponentGroup.VisualStudioExtension.Prerequisites",
+    "Microsoft.Component.CodeAnalysis.SDK",
+    "Microsoft.VisualStudio.Workload.VisualStudioExtension"
+  ],
+  "extensions": []
+}