Add readme example

Author: zsusac

README.md

@@ -19,4 +19,46 @@ Dependencies: React >= 0.13.0
 ## Example
 
 ```javascript
+import React, {Component} from 'react';
+import ReactHTMLTableToExcel from 'react-html-table-to-excel';
+
+class Test extends Component {
+
+    constructor(props) {
+        super(props);
+    }
+
+    render() {
+
+        return (
+            <div>
+                <ReactHTMLTableToExcel
+                    table="table-test"
+                    filename="tabletest"
+                    sheet="tablica"
+                    buttonText="Download as XLS"/>
+                <table id="table-test">
+                    <tr>
+                        <th>Firstname</th>
+                        <th>Lastname</th>
+                        <th>Age</th>
+                    </tr>
+                    <tr>
+                        <td>Jill</td>
+                        <td>Smith</td>
+                        <td>50</td>
+                    </tr>
+                    <tr>
+                        <td>Eve</td>
+                        <td>Jackson</td>
+                        <td>94</td>
+                    </tr>
+                </table>
+
+            </div>
+        );
+    }
+}
+
+export default Test
 ```