title: VS code how to add System.Drawing
body: <p>I want to use system.drawing in my project but I cant make it work. 
  I have found <a href="https://stackoverflow.com/questions/31888274/how-to-reference-assemblies-using-visual-studio-code">this question</a>, but it shows only how to add <code>SQLite.NET-PCL</code>, if I try doing it the same way for System.Drawing it doesnt work. </p>
  
  <p>Here is my <code>project.json</code>:</p>
  
  <pre><code>{
  "version": "1.0.0-*",
  "buildOptions": {
    "debugType": "portable",
    "emitEntryPoint": true
  },
  "dependencies": {
  },
  "frameworks": {
    "net461": {
      "dependencies": {
        "OpenTK": "2.0.0*"
      }
    }
  },
  "runtimes": {
    "win7-x64": {},
    "win10-x64": {}
  }
  }
  </code></pre>
  
  <p>If I try adding System.Drawing it tries to autocomplete to <code>"System.Drawing" : "1.0.0-beta004"</code> which doesnt work with opentk. I am trying to save a image from OpenTK. Is there a way to make this work in VS code?</p>