use .net sdk project and multi-target (#181)

Author: John0King

SocketIoClientDotNet.sln

@@ -0,0 +1,39 @@
+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio 15
+VisualStudioVersion = 15.0.28010.2046
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Src", "Src", "{5522D1EC-43EC-4481-A2A5-0D7D440ADB61}"
+EndProject
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "SocketIoClientDotNet", "Src\SocketIoClientDotNet\SocketIoClientDotNet.csproj", "{41AC286C-AEF5-4262-9DFD-2BA9353B7A6E}"
+EndProject
+Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "test", "test", "{351EC480-13CF-4DEC-AFE8-B2CFE4609A92}"
+EndProject
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "SocketIoClientDotNet.Tests", "test\SocketIoClientDotNet.Tests\SocketIoClientDotNet.Tests.csproj", "{6FEBECB3-B7C2-4612-A843-24C712483E14}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{41AC286C-AEF5-4262-9DFD-2BA9353B7A6E}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{41AC286C-AEF5-4262-9DFD-2BA9353B7A6E}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{41AC286C-AEF5-4262-9DFD-2BA9353B7A6E}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{41AC286C-AEF5-4262-9DFD-2BA9353B7A6E}.Release|Any CPU.Build.0 = Release|Any CPU
+		{6FEBECB3-B7C2-4612-A843-24C712483E14}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{6FEBECB3-B7C2-4612-A843-24C712483E14}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{6FEBECB3-B7C2-4612-A843-24C712483E14}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{6FEBECB3-B7C2-4612-A843-24C712483E14}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(NestedProjects) = preSolution
+		{41AC286C-AEF5-4262-9DFD-2BA9353B7A6E} = {5522D1EC-43EC-4481-A2A5-0D7D440ADB61}
+		{6FEBECB3-B7C2-4612-A843-24C712483E14} = {351EC480-13CF-4DEC-AFE8-B2CFE4609A92}
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {94D8B75E-A477-4C5B-A6F6-8322324C22AD}
+	EndGlobalSection
+EndGlobal