title: How to migrate from .NET Framework 4.6 to .NET Core 3.1
body: <p>I created a new project in VS 2019 in .NET Framework 4.6 and now I want to upgrade it to .NET Core 3.1.</p>
  
  <p>I do not want to do manually because their is ton of code.</p>
  
  <p>How can I do this?</p>