mlnet's generated projects don't include the cs files #4145

System information

• OS version/distro: Windows 10.0.17763
• .NET Version (eg., dotnet --info): 3.0.100-preview8-013656

Issue

• What did you do? I built AutoML mlnet, went to AnyCPU.Debug/mlnet/netcoreapp2.1 and ran the following command: dotnet mlnet.dll auto-train --dataset analcatdata_germangss.csv --ml-task multiclass-classification --label-column-name "Political_system" --max-exploration-time 60 --name "test" --output-path tmp/blah2/
• What happened? mlnet successfully generated the solution, including the 2 projects along with everything needed, but, when opening the solution (or projects), the cs files don't show up and nothing can be built, either via VS or dotnet build until I explicitly include the .cs files.
• What did you expect? For the solutions/projects to work out of the box, I'm not sure why they don't pick up the cs file without being told to.