How to Launch Visual Studio from the Command Line? How to add reference to assembly? to EnvDTE?

Question

I'm following along to Launch Visual Studio using DTE which has the following steps:

1. Create a new Console App project for the .NET Framework.
2. Install the Microsoft.VisualStudio.Setup.Configuration.Interop NuGet package and add a reference to the assembly.
3. Add a reference to EnvDTE.
4. Paste the example code that follows into the Program.cs file.
5. Press F5 to run the program. You should see Visual Studio 2019 open before the program exits.

How do I do:

• add a reference to the assembly.
• Add a reference to EnvDTE.

Is it referring to adding references to the .csproj file? Suing dotnet add reference (package|reference) <something>?