Update README.md

Author: lee-io

README.md

@@ -1,2 +1,16 @@
 # ScriptableObject-Menu
-Create ScriptableObjects from the Unity Editor.
+Create ScriptableObject script and asset file instances from the Unity Editor.
+
+### Installation
+
+Copy the `ScriptableObjectMenu` folder to your Assets folder.
+
+### Usage
+
+Select "Scriptable Object" from either:
+
+- The Menu Bar / Assets / Create / Scriptable Object
+- The Project Window / Create / Scriptable Object
+
+### Preview
+![picture alt](https://raw.githubusercontent.com/lee-io/ScriptableObject-Menu/master/preview.png)