Update README.md

Author: AB-xdev

README.md

@@ -36,13 +36,13 @@ chart.showChart(new BarChart(new BarData()
 
 ### Recommended
 
-Recommended actions:
 1. Use a Java model of Java model of Chart.js's configuration, like [XDEV's chartjs-java-model](https://github.com/xdev-software/chartjs-java-model).<br/>
 Otherwise you have to write the JSON yourself.
 2. Optionally derive classes for your charts (from e.g. ``ChartContainer``) that also handle the data-to-JSON conversion logic.<br/>
 Therefore you can encapsulate the components properly, for example like this: ``FetchFromBackendService.class → Model for chart → ChartContainer.class → Build JSON and show chart``
 
-How the code could look:
+<details><summary>Here is a example how the code could look (click to expand)</summary>
+
 1. Define a custom chart or use the ``showChart``-method directly.<br/>Example:
     ```java
     public class ExampleChartContainer extends ChartContainer
@@ -93,6 +93,8 @@ How the code could look:
     }
     ```
 
+</details>
+
 ## Installation
 [Installation guide for the latest release](https://github.com/xdev-software/vaadin-chartjs-wrapper/releases/latest#Installation)