Added minimal example csharp (C#) visual studio project

examples/csharp_vsproj_dll/libztHelloWorld_csharp.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio 14
+VisualStudioVersion = 14.0.25420.1
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "libztHelloWorld_csharp", "libztHelloWorld_csharp\libztHelloWorld_csharp.csproj", "{78F1D2EC-1F3A-400D-AAA0-CEBA46124452}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{78F1D2EC-1F3A-400D-AAA0-CEBA46124452}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{78F1D2EC-1F3A-400D-AAA0-CEBA46124452}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{78F1D2EC-1F3A-400D-AAA0-CEBA46124452}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{78F1D2EC-1F3A-400D-AAA0-CEBA46124452}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+EndGlobal

examples/csharp_vsproj_dll/libztHelloWorld_csharp/App.config

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+<?xml version="1.0" encoding="utf-8" ?>
+<configuration>
+    <startup> 
+        <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5.2" />
+    </startup>
+</configuration>

examples/csharp_vsproj_dll/libztHelloWorld_csharp/Program.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+using ZeroTier;
+
+namespace libztHelloWorld_csharp
+{
+    class Program
+    {
+        static void Main(string[] args)
+        {
+            Console.Write("waiting for libzt to come online...\n");
+            libzt.zts_startjoin("config_path", "17d709436c2c5367");
+            Console.Write("started. now performing a socket call\n");
+            int fd = libzt.zts_socket(2, 1, 0);
+            Console.Write("fd=%d\n", fd);
+            // zts_connect(), zts_bind(), etc...
+            libzt.zts_stop();
+        }
+    }
+}

examples/csharp_vsproj_dll/libztHelloWorld_csharp/Properties/AssemblyInfo.cs

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+using System.Reflection;
+using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
+
+// General Information about an assembly is controlled through the following 
+// set of attributes. Change these attribute values to modify the information
+// associated with an assembly.
+[assembly: AssemblyTitle("libztHelloWorld_csharp")]
+[assembly: AssemblyDescription("")]
+[assembly: AssemblyConfiguration("")]
+[assembly: AssemblyCompany("")]
+[assembly: AssemblyProduct("libztHelloWorld_csharp")]
+[assembly: AssemblyCopyright("Copyright ©  2017")]
+[assembly: AssemblyTrademark("")]
+[assembly: AssemblyCulture("")]
+
+// Setting ComVisible to false makes the types in this assembly not visible 
+// to COM components.  If you need to access a type in this assembly from 
+// COM, set the ComVisible attribute to true on that type.
+[assembly: ComVisible(false)]
+
+// The following GUID is for the ID of the typelib if this project is exposed to COM
+[assembly: Guid("78f1d2ec-1f3a-400d-aaa0-ceba46124452")]
+
+// Version information for an assembly consists of the following four values:
+//
+//      Major Version
+//      Minor Version 
+//      Build Number
+//      Revision
+//
+// You can specify all the values or you can default the Build and Revision Numbers 
+// by using the '*' as shown below:
+// [assembly: AssemblyVersion("1.0.*")]
+[assembly: AssemblyVersion("1.0.0.0")]
+[assembly: AssemblyFileVersion("1.0.0.0")]

examples/csharp_vsproj_dll/libztHelloWorld_csharp/libzt.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+using System.Runtime.InteropServices;
+
+namespace ZeroTier
+{
+    static class libzt
+    {
+        [DllImport("libzt.dll", CallingConvention = CallingConvention.StdCall)]
+        public static extern int zts_startjoin(string path, string nwid);
+
+        [DllImport("libzt.dll", CallingConvention = CallingConvention.StdCall)]
+        public static extern int zts_socket(int socket_family, int socket_type, int protocol);
+
+        [DllImport("libzt.dll", CallingConvention = CallingConvention.StdCall)]
+        public static extern int zts_stop();
+    }
+}

examples/csharp_vsproj_dll/libztHelloWorld_csharp/libztHelloWorld_csharp.csproj

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+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="14.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <Import Project="$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props" Condition="Exists('$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props')" />
+  <PropertyGroup>
+    <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
+    <Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
+    <ProjectGuid>{78F1D2EC-1F3A-400D-AAA0-CEBA46124452}</ProjectGuid>
+    <OutputType>Exe</OutputType>
+    <AppDesignerFolder>Properties</AppDesignerFolder>
+    <RootNamespace>libztHelloWorld_csharp</RootNamespace>
+    <AssemblyName>libztHelloWorld_csharp</AssemblyName>
+    <TargetFrameworkVersion>v4.5.2</TargetFrameworkVersion>
+    <FileAlignment>512</FileAlignment>
+    <AutoGenerateBindingRedirects>true</AutoGenerateBindingRedirects>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
+    <PlatformTarget>x64</PlatformTarget>
+    <DebugSymbols>true</DebugSymbols>
+    <DebugType>full</DebugType>
+    <Optimize>false</Optimize>
+    <OutputPath>bin\Debug\</OutputPath>
+    <DefineConstants>DEBUG;TRACE</DefineConstants>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+    <Prefer32Bit>false</Prefer32Bit>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
+    <PlatformTarget>AnyCPU</PlatformTarget>
+    <DebugType>pdbonly</DebugType>
+    <Optimize>true</Optimize>
+    <OutputPath>bin\Release\</OutputPath>
+    <DefineConstants>TRACE</DefineConstants>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+  </PropertyGroup>
+  <ItemGroup>
+    <Reference Include="System" />
+    <Reference Include="System.Core" />
+    <Reference Include="System.Xml.Linq" />
+    <Reference Include="System.Data.DataSetExtensions" />
+    <Reference Include="Microsoft.CSharp" />
+    <Reference Include="System.Data" />
+    <Reference Include="System.Net.Http" />
+    <Reference Include="System.Xml" />
+  </ItemGroup>
+  <ItemGroup>
+    <Compile Include="libzt.cs" />
+    <Compile Include="Program.cs" />
+    <Compile Include="Properties\AssemblyInfo.cs" />
+  </ItemGroup>
+  <ItemGroup>
+    <None Include="App.config" />
+    <None Include="libzt.lib" />
+  </ItemGroup>
+  <ItemGroup>
+    <Content Include="libzt.dll" />
+  </ItemGroup>
+  <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
+  <!-- To modify your build process, add your task inside one of the targets below and uncomment it. 
+       Other similar extension points exist, see Microsoft.Common.targets.
+  <Target Name="BeforeBuild">
+  </Target>
+  <Target Name="AfterBuild">
+  </Target>
+  -->
+</Project>