Add OS-specific interop

Source/LoadByOS/MacOSConfigApp/MacOSConfigApp.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net6.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <AppendTargetFrameworkToOutputPath>false</AppendTargetFrameworkToOutputPath>
+    <AppendRuntimeIdentifierToOutputPath>false</AppendRuntimeIdentifierToOutputPath>
+  </PropertyGroup>
+
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|AnyCPU'">
+    <OutputPath>..\..\bin\Avalonia\Debug</OutputPath>
+    <DebugType>embedded</DebugType>
+  </PropertyGroup>
+
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|AnyCPU'">
+    <OutputPath>..\..\bin\Avalonia\Release</OutputPath>
+    <DebugType>embedded</DebugType>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\..\AppScaffolding\AppScaffolding.csproj" />
+  </ItemGroup>
+
+</Project>

Source/LoadByOS/MacOSConfigApp/MacOSInterop.cs

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+using AppScaffolding.OSInterop;
+
+namespace MacOSConfigApp
+{
+    internal class MacOSInterop : IInteropFunctions
+    {
+        public MacOSInterop() { }
+        public MacOSInterop(params object[] values) { }
+
+
+        // examples until the real interface is filled out
+        private string InitValue1 { get; }
+        private int InitValue2 { get; }
+
+        public MacOSInterop(string initValue1, int initValue2)
+        {
+            InitValue1 = initValue1;
+            InitValue2 = initValue2;
+        }
+
+        public string TransformInit1() => InitValue1.ToLower();
+
+        public int TransformInit2() => InitValue2 + InitValue2;
+
+        public void CopyTextToClipboard(string text) => throw new PlatformNotSupportedException();
+        public void ShowForm() => throw new PlatformNotSupportedException();
+    }
+}

Source/LoadByOS/MacOSConfigApp/Program.cs

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+using AppScaffolding.OSInterop;
+
+namespace MacOSConfigApp
+{
+    class Program : OSConfigBase
+    {
+        public override Type InteropFunctionsType => typeof(MacOSInterop);
+
+        static void Main() => new Program().Run();
+    }
+}