generator-office

This creates the scaffolding of files for your Office Add-in project.
You can choose to create Office Add-in projects using plain HTML, CSS & JavaScript, or using Angular or React, and can choose between JavaScript and Typescript as well.

Install the 'generator-office' Generator

link - npmjs.com/package/generator-office 
link - github.com/officedev/generator-office 

npm install -g yo generator-office 

installs to the following location:

C:\users\russell\AppData\Roaming\npm\node_modules\generator-office 

To check your version of generator-office is installed

npm view generator-office version  // 1.8.1 

Before running the office yeoman generator switch to the relevant folder.

cd C:\temp\yeoman-sample\ 
yo Office