added example to readme

Author: splitice

README.md

@@ -2,4 +2,18 @@
 
 [![Build Status](https://travis-ci.org/splitice/QuadTrees.png?branch=master)](https://travis-ci.org/splitice/QuadTrees)
 
-High Performance Quad Tree Implementations for C# (Point, Rect and PointInv)
+High Performance Quad Tree Implementations for C# (Point, Rect and PointInv)
+
+## Example
+
+```
+QuadTreeRect<QTreeObject> qtree = new QuadTreeRect<QTreeObject>();
+qtree.AddRange(new List<QTreeObject>
+{
+	new QTreeObject(new RectangleF(10,10,10,10)), // Expected result
+	new QTreeObject(new RectangleF(-1000,1000,10,10))
+});
+
+var list = new List<QTreeObject>();
+qtree.GetObjects(new RectangleF(9, 9, 20, 20), list);
+```