add 3rd party folders back

3rd/libomt/libomt.csproj

@@ -0,0 +1,28 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net8.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+    <PublishAot>true</PublishAot>
+    <Version>1.0.0.13</Version>
+    <Configurations>Debug;Release</Configurations>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <Reference Include="libomtnet">
+      <HintPath>..\libomtnet\bin\Release\netstandard2.0\libomtnet.dll</HintPath>
+    </Reference>
+  </ItemGroup>
+
+  <ItemGroup>
+    <LinkerArg Condition="$(RuntimeIdentifier.StartsWith('osx'))" Include="-mmacosx-version-min=10.15" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <None Update="libomt.h">
+      <CopyToOutputDirectory>Always</CopyToOutputDirectory>
+    </None>
+  </ItemGroup>
+
+</Project>