Complete porting of Examples for Developers Sub-modules to D8

I propose to port Examples for developers sub-modules from Drupal 7 to Drupal 8. The function of Examples for Developers is that it would provide high-quality, well documented API examples for a broad range of Drupal core functionality thus developers can learn how to use a particular API by just experimenting with its module thereby they can adapt them for their own use so it is mandatory that it should be ported to Drupal 8(currently it is not configurable). As the project concentrate only on core API, each have their own importance.