add System.Text.Json nuget

Author: andreaskueffel

FileSyncLibNet/FileSyncLibNet.csproj

@@ -16,6 +16,7 @@
     <PackageReference Include="RoboSharp" Version="1.5.3" />
     <PackageReference Include="SMBLibrary" Version="1.5.3.5" />
     <PackageReference Include="SSH.NET" Version="2024.1.0" />
+    <PackageReference Include="System.Text.Json" Version="9.0.0" />
   </ItemGroup>
   <ItemGroup>
     <Content Include="../README.md">