Merge pull request facebook#2075 from IvanVergiliev/patch-1

Add 2048-react to open-source demos

Author: zpao

docs/docs/examples.md

@@ -26,3 +26,4 @@ prev: complementary-tools.html
 * **[Khan Academy question editor](https://github.com/khan/perseus)** (Browse their GitHub account for many more production apps!)
 * **[github-issue-viewer](https://github.com/jaredly/github-issues-viewer)**
 * **[hn-react](https://github.com/prabirshrestha/hn-react)** Dead-simple Hacker News client.
+* **[2048-react](https://github.com/IvanVergiliev/2048-react)** A clone of the 2048 game.