Add pointer to the React Wrapper in README (#238)

* Add pointer to the React Wrapper in README

* Remove "please"

Author: nicolasgarnier

README.md

@@ -36,8 +36,9 @@ SDK supports them in a way that is compatible with FirebaseUI.
 6. [Advanced](#advanced)
 7. [Developer Setup](#developer-setup)
 8. [Cordova Setup](#cordova-setup)
-9. [Known issues](#known-issues)
-10. [Release Notes](#release-notes)
+9. [React DOM Setup](#react-dom-setup)
+10. [Known issues](#known-issues)
+11. [Release Notes](#release-notes)
 
 ## Demo
 
@@ -798,6 +799,10 @@ always be disabled.
 appropriate exceptions for FirebaseUI resources (`style-src`, `media-src`,
 `img-src`, `script-src`, etc.) and underlying Firebase JS SDK.
 
+## React DOM Setup
+
+In React DOM applications use the [FirebaseUI Web React Wrapper](https://github.com/firebase/firebaseui-web-react).
+
 ## Known issues
 
 ### Firebase Auth does not work in Safari private browsing