title: Add a project.json based project to a .sln file without using Visual Studio
body: <p>We have developers that are using VS Code on Linux, Windows, and Mac. We also have developers that are using full Visual Studio on Windows. A problem arises when the former (including me) do not add their projects to the solution, and the latter therefor do not see the projects in the solution. </p>
  
  <p>How can developers add their project.json projects to a <code>sln</code> without having to open Visual Studio? </p>