Add project to solution

csharp/src/Google.Protobuf.sln

@@ -1,4 +1,4 @@
-Microsoft Visual Studio Solution File, Format Version 12.00
+Microsoft Visual Studio Solution File, Format Version 12.00
 # Visual Studio 15
 VisualStudioVersion = 15.0.26114.2
 MinimumVisualStudioVersion = 10.0.40219.1
@@ -14,6 +14,8 @@ Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Google.Protobuf.JsonDump",
 EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Google.Protobuf.Benchmarks", "Google.Protobuf.Benchmarks\Google.Protobuf.Benchmarks.csproj", "{D25E4804-4DEA-45AB-9F8C-BA4DBD8E5A07}"
 EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Google.Protobuf.Test.TestProtos", "Google.Protobuf.Test.TestProtos\Google.Protobuf.Test.TestProtos.csproj", "{ADF24BEB-A318-4530-8448-356B72B820EA}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -44,6 +46,10 @@ Global
 		{D25E4804-4DEA-45AB-9F8C-BA4DBD8E5A07}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{D25E4804-4DEA-45AB-9F8C-BA4DBD8E5A07}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{D25E4804-4DEA-45AB-9F8C-BA4DBD8E5A07}.Release|Any CPU.Build.0 = Release|Any CPU
+		{ADF24BEB-A318-4530-8448-356B72B820EA}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{ADF24BEB-A318-4530-8448-356B72B820EA}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{ADF24BEB-A318-4530-8448-356B72B820EA}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{ADF24BEB-A318-4530-8448-356B72B820EA}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE