Include example HTML5 Drag and Drop API

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There is a chapter called [“Drag'n'Drop with mouse events”](https://javascript.info/mouse-drag-and-drop), and it makes a passing reference to the Drag and Drop API. There are plenty of cases where it’s appropriate to choose this approach.

However, I think there also needs to be a “Drag'n'Drop with the API” chapter.

I’ve been using the DND API on a learning project. Although I got over the strange hurdle of learning which events apply to draggable items and which events apply to drop zones, I’m at a point where I am really missing the awesome guidance I can find on most other topics in your excellent work.

For the purpose of inspiration in creating such a chapter (or for anyone else reading this), one tutorial I found helpful helpful is this video (which includes the basics of the DND API, and implements a list-sorting feature):

https://www.youtube.com/watch?v=jfYWwQrtzzY

Lee el capítulo existente «Drag'n'Drop with mouse events» en https://javascript.info/mouse-drag-and-drop y revisa el vídeo tutorial referenciado para comprobar la cobertura de la HTML5 Drag and Drop API. La tarea estará terminada cuando se añada un capítulo nuevo que explique la API, incluidos los eventos de draggable-item y drop-zone, y ofrezca orientación práctica sobre cuándo usarla.

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