Add README.md to solution file.

pbench.sln

@@ -1,12 +1,17 @@
 
 Microsoft Visual Studio Solution File, Format Version 12.00
-# Visual Studio 14
-VisualStudioVersion = 14.0.25123.0
+# Visual Studio Version 17
+VisualStudioVersion = 17.8.34330.188
 MinimumVisualStudioVersion = 10.0.40219.1
 Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "pbench", "pbench\pbench.vcxproj", "{EDBDD074-5636-42BF-9326-A53E35898078}"
 EndProject
 Project("{F5034706-568F-408A-B7B3-4D38C6DB8A32}") = "PSModule", "PSModule\PSModule.pssproj", "{6CAFC0C6-A428-4D30-A9F9-700E829FEA51}"
 EndProject
+Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Solution Items", "Solution Items", "{04A1D8BD-02B0-48A1-8C45-F97BE45E2CC7}"
+	ProjectSection(SolutionItems) = preProject
+		README.md = README.md
+	EndProjectSection
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU