setup initial C# CoreWrapper class and utilize it in sample cli app

bindings/c#/Mgtt.CoreWrapper/CoreWrapper.cs

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+using System;
+using System.Runtime.InteropServices;
+
+namespace Mgtt.CoreWrapper
+{
+    public class CoreWrapper
+    {
+        public static string _libraryPath {get; set;}
+
+        [DllImport("{LibraryPath}", EntryPoint = "add")]
+        public static extern int Add(int a, int b);
+
+        [DllImport("{LibraryPath}", EntryPoint = "subtract")]
+        public static extern int Subtract(int a, int b);
+
+        [DllImport("{LibraryPath}", EntryPoint = "multiply")]
+        public static extern int Multiply(int a, int b);
+
+        [DllImport("{LibraryPath}", EntryPoint = "divide")]
+        public static extern float Divide(float a, float b);
+
+        [DllImport("{LibraryPath}", EntryPoint = "getCircleArea")]
+        public static extern float GetCircleArea(float radius);
+
+        [DllImport("{LibraryPath}", EntryPoint = "getCircleCircumference")]
+        public static extern float GetCircleCircumference(float radius);
+    }
+}

bindings/c#/Mgtt.CoreWrapper/Mgtt.CoreWrapper.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net8.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="CommandLineParser" Version="2.9.1" />
+  </ItemGroup>
+
+</Project>

bindings/c#/Mgtt.CoreWrapper/Program.cs

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+using CommandLine;
+
+namespace Mgtt.CoreWrapper;
+class Program
+{
+    static int Main(string[] args)
+    {
+        Options options = null;
+        Parser.Default.ParseArguments<Options>(args)
+            .WithParsed(o => options = o);
+
+        if (options == null)
+        {
+            Console.WriteLine("Usage: dotnet run --coreLibraryPath <coreLibraryPath>");
+            return 1;
+        }
+
+        CoreWrapper._libraryPath = options.CoreLibraryPath;
+
+        int resultAdd = CoreWrapper.Add(10, 5);
+        Console.WriteLine("Addition result: " + resultAdd);
+
+        int resultSubtract = CoreWrapper.Subtract(10, 5);
+        Console.WriteLine("Subtraction result: " + resultSubtract);
+
+        int resultMultiply = CoreWrapper.Multiply(10, 5);
+        Console.WriteLine("Multiplication result: " + resultMultiply);
+
+        float resultDivide = CoreWrapper.Divide(10.0f, 2.0f);
+        Console.WriteLine("Division result: " + resultDivide);
+
+        float radius = 5.0f;
+
+        float area = CoreWrapper.GetCircleArea(radius);
+        Console.WriteLine("Circle area: " + area);
+
+        float circumference = CoreWrapper.GetCircleCircumference(radius);
+        Console.WriteLine("Circle circumference: " + circumference);
+
+        return 0;
+    }
+}
+
+public class Options
+{
+    [Option("coreLibraryPath", Required = true, HelpText = "Path to the core library.")]
+    public string CoreLibraryPath { get; set; }
+}