message: Added a note about using tsconfig.json to README
diff: @@ -30,6 +30,18 @@ class MyElement extends Polymer.Element {
  }
  ```
  +Alternatively, you can add the dependency to `tsconfig.json` in the root of your project:
  +
  +```javascript
  +{
  +...
  + "include": [
  + "src/**/*.ts",
  + "src/bower_components/polymer/**/*.d.ts",
  + ]
  +}
  +```
  +
  Typings for Polymer 3 are planned but not yet available (see
  [#18](https://github.com/Polymer/gen-typescript-declarations/issues/18)).
  