add example code

Author: timhaywood

README.md

@@ -23,9 +23,8 @@ It comes in the form of a JSON file that's imported into the project, and then r
 - [Overview](#overview)
 - [Contents](#contents)
 - [Compatibility](#compatibility)
-- [Usage](#usage)
-  - [4. Use effector properties](#4-use-effector-properties)
 - [Example](#example)
+- [Usage](#usage)
 - [License](#license)
 - [Contact](#contact)
 
@@ -35,6 +34,21 @@ This aeFunctions is compatible with After Effects versions >= 16.0.1 (CC2019) wh
 
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+## Example
+
+Example layer attraction setup using eTractors:
+
+```javascript
+// Import the library
+const eTractors = footage('eTractors.jsx').sourceData;
+
+// Create a new effector
+const myEffector = eTractors.createEffector(effectorLayer, particlePosition);
+
+// Move towards the effector layer
+particlePosition + myEffector.attract;
+```
+
 ## Usage
 
 ### 1. **Download and import `eTractors.jsx` into your After Effects project** <!-- omit in toc -->