- Under the "interpret-core" project, under "Python Environments", right click and select "Add environment"
- Use the defaults for the environment, especially the environment name of "env".  
- Wait until the requirements.txt are fully installed
- right click "env" under the project "Python Environments", select "Open command prompt here..."
- run "cd .."
- run "pip install -r dev-requirements.txt"
- there will be a failure to generate the wheel, but that's ok

- MORE INFO: https://github.com/MicrosoftDocs/visualstudio-docs/issues/644#issuecomment-370613022
