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Use npm Packages

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              <script type="text/javascript" src="//code.jquery.com/jquery-1.11.1.min.js"></script>
<script type="text/javascript" src="//golden-layout.com/files/latest/js/goldenlayout.min.js"></script>
<link type="text/css" rel="stylesheet" href="//golden-layout.com/files/latest/css/goldenlayout-base.css" />
<link type="text/css" rel="stylesheet" href="//golden-layout.com/files/latest/css/goldenlayout-dark-theme.css" />

<div id="wrapper">
  <ul id="menuContainer"></ul>
  <div id="layoutContainer"></div>
  font: 14px Arial, sans-serif;
  padding: 10px;
  text-align: center;

html, body{
  height: 100%;

  margin: 0;
  padding: 0;

  height: 100%;
  position: relative;
  width: 100%;
  overflow: hidden;

  width: 20%;
  height: 100%;
  top: 0;
  left: 0;
  background: #222;

#menuContainer li{
  border-bottom: 1px solid #000;
  border-top: 1px solid #333;
  cursor: pointer;
  padding: 10px 5px;
  color: #BBB;
  background: #1a1a1a;
  font: 12px Arial, sans-serif;

#menuContainer li:hover{
  background: #111;
  color: #CCC;

  width: 80%;
  height: 100%;
  top: 0;
  left: 20%;
  box-shadow: -3px 0px 9px 0px rgba( 0, 0, 0, 0.4 );
              var config = {
    content: [{
        type: 'row',
      	isClosable: false,
        content: [{
            componentName: 'example',
            componentState: { text: 'Component 1' }
            componentName: 'example',
            componentState: { text: 'Component 2' }

var myLayout = new window.GoldenLayout( config, $('#layoutContainer') );

myLayout.registerComponent( 'example', function( container, state ){
    container.getElement().html( '<h2>' + state.text + '</h2>');


var addMenuItem = function( title, text ) {
    var element = $( '<li>' + text + '</li>' );
    $( '#menuContainer' ).append( element );

    var newItemConfig = {
        title: title,
        type: 'component',
        componentName: 'example',
        componentState: { text: text }
        myLayout.root.contentItems[ 0 ].addChild( newItemConfig );

addMenuItem( 'Add me!', 'You\'ve added me!' );
addMenuItem( 'Me too!', 'You\'ve added me too!' );

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