title: .Net Core 2.0 appsettings with .net full framework using ConfigurationManager
body: <p>Assuming the following project structure:</p>
  
  <ol>
  <li><p><strong>Project A:</strong></p>
  
  <ul>
  <li>.net full framework ( 4.6.2)</li>
  <li>internally accesses configuration via: </li>
  </ul>
  
  <p>ConfigurationManager.AppSettings["key"];</p></li>
  <li><p><strong>Project B:</strong></p>
  
  <ul>
  <li>.net core 2.0 ( compiling to .net 4.6.2)</li>
  <li>references and uses project A </li>
  </ul></li>
  </ol>
  
  <p><strong>The Problem:</strong> <br>
  .net core uses the new configuration mechanism - is there a way to hook up the .net core config ( in project B) in a way that will enable project A to consume configuration via ConfigurationManager - i.e without code changes in project A ? </p>
  
  <p>adding NuGet package System.Configuration.ConfigurationManager like in <a href="https://stackoverflow.com/questions/47591910/is-configurationmanager-appsettings-available-in-net-core-2-0">this answer</a>
  only adds ConfigurationManager to project B but in project A no configuration is available via ConfigurationManager </p>