title: how to add a new c# file to a project using dotnet-cli
body: <p>I'm learning how to use dotnet-cli with VSCode. I've seen many commands on how to create solution, projects, add reference to projects... but I don't see anywhere in the documentation how to add a file. If remember, in RubyOnRails it was possible to add file from the command line. </p>
  
  <p>Thanks for helping</p>