started creating spreadsheet component

app/components/ChooseFile.react.js

@@ -1,12 +1,23 @@
+/** @jsx React.DOM */
+
 var React = require('react');
 
 var ChooseFile = React.createClass({
 
-	render: function() {
-		return (
-		<button className="red-button">ChooseFile</button>
-		);
-	}
+    getInitialState: function () {
+        return {fileName: ""};
+    },
+
+    render: function () {
+        if (this.state.fileName === "") {
+            return (<input type="file" accept=".csv" onChange={this._onChange}/>);
+        } else
+            return (<div>Editing file.</div>);
+    },
+
+    _onChange: function(e) {
+        this.setState({fileName: e.target.value})
+    }
 });
 
 module.exports = ChooseFile;