Add github readme to solution

Author: josephdecock

IdentityModel.OidcClient.sln

@@ -29,6 +29,11 @@ Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "TrimmableAnalysis", "test\T
 EndProject
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "ManualModeConsoleClient", "clients\ManualModeConsoleClient\ManualModeConsoleClient.csproj", "{864F9320-43C3-494E-946A-B19B4A7D1CA3}"
 EndProject
+Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Solution Items", "Solution Items", "{8EB34682-F5A0-4F91-A624-64F042B5B910}"
+	ProjectSection(SolutionItems) = preProject
+		README.md = README.md
+	EndProjectSection
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU