learn polymer 3, project hosted on https://polymer-app-ab8b3.firebaseapp.com/
polymer serve # start project
polymer build # build project
polymer lint # run linter
polymer test # test project
firebase deploy # deploy app to firebase
images/
index.html # main entry point into your app
manifest.json # app manifest configuration
node_modules # installed npm dependencies used in your app
package-lock.json # dependency management file generated by npm
package.json # npm metadata file
polymer.json # Polymer CLI configuration
service-worker.js # auto-generated service worker
src/ # app-specific elements
my-app.js # top-level element
my-icons.js # app icons
my-view1.js # sample views or "pages"
my-view2.js
my-view3.js
my-view404.js # sample 404 page
shared-styles.js # sample shared styles
sw-precache-config.js # service worker pre-cache configuration
test/ # unit tests