Include nuget files in project for easy editing

Author: amaitland

CefSharp3.sln

@@ -42,6 +42,8 @@ Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "NuGet", "NuGet", "{A23AA466
 		NuGet\CefSharp.Common.nuspec = NuGet\CefSharp.Common.nuspec
 		NuGet\CefSharp.Common.props = NuGet\CefSharp.Common.props
 		NuGet\CefSharp.Common.targets = NuGet\CefSharp.Common.targets
+		NuGet\CefSharp.OffScreen.nuspec = NuGet\CefSharp.OffScreen.nuspec
+		NuGet\CefSharp.OffScreen.props = NuGet\CefSharp.OffScreen.props
 		NuGet\CefSharp.WinForms.nuspec = NuGet\CefSharp.WinForms.nuspec
 		NuGet\CefSharp.WinForms.props = NuGet\CefSharp.WinForms.props
 		NuGet\CefSharp.Wpf.nuspec = NuGet\CefSharp.Wpf.nuspec