It's just a simple sample app (shopping cart) build with the new Polymer 1.0
Node.js (install node.js and npm)
1. $ git clone git@github.com:nosch/polymer1-sample-app.git "polymer1-sample-app"
2. $ cd polymer1-sample-app
3. $ npm install
$ npm start (opens app in browser)
$ npm run build (creates build.html in project root)