Add findDOMNode transform

npm-react-codemod/README.md

@@ -11,6 +11,17 @@ APIs.
   * Use the `-d` option for a dry-run and use `-p` to print the output
     for comparison
 
+### Included Scripts
+
+`findDOMNode.js` updates `this.getDOMNode()` or `this.refs.foo.getDOMNode()`
+calls inside of `React.createClass` components to `React.findDOMNode(foo)`. Note
+that it will only look at code inside of `React.createClass` calls and only
+update calls on the component instance or its refs. You can use this script to
+update most calls to `getDOMNode` and then manually go through the remaining
+calls.
+
+  * `react-codemod findDOMNode <file>`
+
 ### Recast Options
 
 Options to [recast](https://github.com/benjamn/recast)'s printer can be provided