Update index.html with a new `flutter create` that links manifest.json and loads flutter_service_worker.js (#130)
Update index.html with a new `flutter create` that links manifest.json and loads flutter_service_worker.js (#130)

* update index.html with manifest.json link and service_worker script

* Add body background color and title

* formatting

Former-commit-id: e2750fd30f1416a67db6c15ad028a49546096ee6
flutter/gallery,flutter/gallery,flutter/gallery,flutter/gallery,flutter/gallery,flutter/gallery,flutter/gallery