To build and run this locally you neeed to have node.js installed.
npm install
for local development
npm start
to build for production
npm run build
to bundle the extension as ZIP-file run
npm run build
npm run buildZipFile
Unit tests and UI-tests are upcomming.
First you build to package. After that, follow Googles guide to test the extension locally https://developer.chrome.com/docs/extensions/mv3/getstarted/#unpacked