Add project files.

SysEx.Net.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio 15
+VisualStudioVersion = 15.0.27428.2043
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "SysEx.Net", "SysEx.Net\SysEx.Net.csproj", "{2C847B95-0FEB-4323-962F-E21D3E879383}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{2C847B95-0FEB-4323-962F-E21D3E879383}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{2C847B95-0FEB-4323-962F-E21D3E879383}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{2C847B95-0FEB-4323-962F-E21D3E879383}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{2C847B95-0FEB-4323-962F-E21D3E879383}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {F191F76A-5A6E-4394-95BF-2FAB261D41A8}
+	EndGlobalSection
+EndGlobal

SysEx.Net/Class1.cs

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+using System;
+
+namespace SysEx.Net
+{
+    public class Class1
+    {
+    }
+}

SysEx.Net/SysEx.Net.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>netstandard2.0</TargetFramework>
+  </PropertyGroup>
+
+</Project>