Add extra prop/target files to solution items folder

Author: michael-hawker

Windows Community Toolkit.sln

@@ -1,6 +1,6 @@
 Microsoft Visual Studio Solution File, Format Version 12.00
-# Visual Studio Version 17
-VisualStudioVersion = 17.0.31521.260
+# Visual Studio Version 16
+VisualStudioVersion = 16.0.31605.320
 MinimumVisualStudioVersion = 10.0.40219.1
 Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Samples", "Samples", "{9AD30620-667D-433C-9961-8D885EE7B762}"
 EndProject
@@ -50,6 +50,13 @@ Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Solution Items", "Solution
 		Directory.Build.targets = Directory.Build.targets
 		global.json = global.json
 		settings.xamlstyler = settings.xamlstyler
+		build\Windows.Toolkit.Common.props = build\Windows.Toolkit.Common.props
+		build\Windows.Toolkit.Common.targets = build\Windows.Toolkit.Common.targets
+		build\Windows.Toolkit.UWP.Build.targets = build\Windows.Toolkit.UWP.Build.targets
+		build\Windows.Toolkit.UWP.Controls.targets = build\Windows.Toolkit.UWP.Controls.targets
+		build\Windows.Toolkit.VisualStudio.Design.props = build\Windows.Toolkit.VisualStudio.Design.props
+		build\Windows.Toolkit.VisualStudio.Design.targets = build\Windows.Toolkit.VisualStudio.Design.targets
+		build\Windows.Toolkit.Workarounds.Xaml.targets = build\Windows.Toolkit.Workarounds.Xaml.targets
 	EndProjectSection
 EndProject
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Microsoft.Toolkit.Uwp.UI.Controls.Core.DesignTools", "Microsoft.Toolkit.Uwp.UI.Controls.Core.Design\Microsoft.Toolkit.Uwp.UI.Controls.Core.DesignTools.csproj", "{7AEFC959-ED7C-4D96-9E92-72609B40FBE0}"