cdk proposal: framework for rich text editors ("draftjs" for angular)

tl;dr https://draftjs.org/ for angular

I've been searching the internets and there is nothing that comes even close to draftjs, which is built on top and requires react. What does it do? It solves most of the [contenteditable issues](https://medium.engineering/why-contenteditable-is-terrible-122d8a40e480) and provides api for people to build their own rich text editors on top of it.

Rich text editor doesn't necessarily mean WYSIWYG textarea, it can help with anything from mentions, hashtags to replacing text emoticons with images etc.


Some of the most popular draftjs plugins can be found [here](https://www.draft-js-plugins.com/) and [here](https://github.com/nikgraf/awesome-draft-js), it should give you an idea what can be done with it.

worth reading:
- https://code.facebook.com/posts/1684092755205505/facebook-open-sources-rich-text-editor-framework-draft-js/
- https://medium.com/@rajaraodv/why-draft-js-and-why-you-should-contribute-460c4a69e6c8
- https://medium.com/@rajaraodv/how-draft-js-represents-rich-text-data-eeabb5f25cf2

I think this could be a great fit for CDK, given that you are eventually planning on creating WYSIWYG anyway.. what do you think?

@jelbourn @mmalerba @kara @andrewseguin @DevVersion @crisbeto

Commencez par examiner les ressources Draft.js et le contexte Angular CDK décrits dans l’issue, y compris les références liées à l’éditeur et aux plugins. Définissez l’intégration Angular proposée, le périmètre de l’API et les critères d’acceptation avant l’implémentation ; le travail est terminé lorsque la conception du framework et son adéquation au projet sont convenues.

Rédigé par le modèle d'indexation à partir du texte de l'issue.