title: How do I leverage existing C# (.NET 4.5.x) in a .net-core (DotNetCore 1.0) application
body: <p>I've got a netcoreapp1.0 (Microsoft.NETCore.App) application that is a kestrel based web service and I'd like to leverage some of my existing C# DLLs (.NET 4.5.x)  I also have a few other netstandard1.6 (NETStandard.Library) assemblies that I'm using.<br>
  The big question: is it possible to pull in legacy code without porting it all to DotNetCore 1.0?</p>
  
  <p>Breaking it down, I suppose I'd like to know:</p>
  
  <ol>
  <li>What is the correct framework target for my application?  I'm assuming it has to be netcoreapp1.0 rather than net451.</li>
  <li>What imports (ex. dnxcore50, net451) does my application require?</li>
  <li>What additions need to be made to my C# assembly?  Is a project.json sufficient or does having an xproj provide some additional value?</li>
  <li>What is the correct framework target for my C# assembly?  I'm assuming NETStandard.Library 1.6.0 is wrong since I believe it would require code changes to get compiling.</li>
  </ol>
  
  <p>Any suggestions and/or guidance would be greatly appreciated. Thanks!</p>