Updated readme

examples/react_demo/README.md

@@ -1,3 +1,33 @@
 # JSONEditor React demo
 
-TODO: describe the demo
+## Install
+
+To run this demo, install npm dependencies once:
+
+```
+npm install
+```
+
+## Develop
+
+Then start a development server:
+
+```
+npm start
+```
+
+The development server is available at http://localhost:3000
+
+## Bundle
+
+To create a bundle:
+
+```
+npm run build
+```
+
+## About
+
+This demo was created using `create-react-app`
+
+https://github.com/facebookincubator/create-react-app