You can use Local WP to create a local development environment on your computer. It is what I use and recommend for local WordPress development.
Then, in any local WP project; go into the project's app/public/wp-content/themes folder and place the folder/files from this repository as a new theme folder in that themes folder.
Then, open that theme folder up in VS Code, run the npm install command, and then the npm run start command and begin working while it runs in the background and watches your files for CSS class names. Enjoy!