Added UnityEvent node example

Author: alelievr

Assets/Examples/DefaultNodes/Nodes/UnityEventNode.cs

@@ -0,0 +1,25 @@
+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+using GraphProcessor;
+using System.Linq;
+using UnityEngine.Events;
+
+[System.Serializable, NodeMenuItem("Custom/Unity Event Node")]
+public class UnityEventNode : BaseNode
+{
+	[Input(name = "In")]
+    public float                input;
+
+	[Output(name = "Out")]
+	public float				output;
+
+	public UnityEvent			evt;
+
+	public override string		name => "Unity Event Node";
+
+	protected override void Process()
+	{
+	    output = input * 42;
+	}
+}