Add Draft.js

I tried to add it early March when the list was too young. I have maintained the list since then and would be happy to add it here.

This was the first PR https://github.com/sindresorhus/awesome/pull/564

Closes #668

readme.md

@@ -177,6 +177,7 @@ Check out my [blog](https://blog.sindresorhus.com) and follow me on [Twitter](ht
 - [Ionic Framework 2](https://github.com/candelibas/awesome-ionic2)
 - [Chrome DevTools](https://github.com/ChromeDevTools/awesome-chrome-devtools)
 - [PostCSS](https://github.com/jjaderg/awesome-postcss)
+- [Draft.js](https://github.com/nikgraf/awesome-draft-js) - Rich text editor framework for React.
 
 
 ## Back-End Development