Update README.md

Author: ZorTik

README.md

@@ -7,6 +7,24 @@ Advanced configuration library with mapping for Bukkit!<br>
 ![Badge](https://img.shields.io/jitpack/version/com.github.ZorTik/ConfigurationLib?style=for-the-badge) ![Badge](https://img.shields.io/github/license/ZorTik/ConfigurationLib?style=for-the-badge)
 </div>
 
+```java
+@AllArgsContructor
+class Item {
+  private String name;
+  private String description;
+}
+
+SectionNode<?> node = ...;
+node.set("items.item1", new User("Item 1", "The first item"));
+```
+becomes
+```yaml
+items:
+  item1:
+    name: Item 1
+    description: The first item
+```
+
 ## About
 This library is designed to help you build Bukkit configurations quick and easy. It has bunch of good features that you don't want to miss. You can see some of them through official wiki on this repository.