Update to README.md

Author: augustdominik

README.md

@@ -2,4 +2,17 @@
 
 ![](Demonstration.gif)
 
+# Installation
+Using Package Manager:
+
 # Usage
+Code for the demonstration above:
+```C#
+[MinMaxSlider(0,10)] 
+public Vector2 floatTest = new Vector2(2f, 8f);
+
+[MinMaxSlider(0,10)]
+public Vector2Int intTest;
+```
+
+Very simple and very handy!