Add createdon and createdby to settings tab

plugin.createdOnBy.php

<?php
/**
 * Sample plugin to add a "createdby and createdon" field on a resource form
 * Background: Issue #12305 "Adding createdon/createdby/publishedby/etc. to settings"
 * https://github.com/modxcms/revolution/issues/12305
 * 
 * Original author: rtripaul
 * Original source: https://gist.github.com/rtripault/7306c8487a39fd1ce0db5f334c99be57
 * 
 * @var modX $modx
 * @var array $scriptProperties
 *
 * @event OnDocFormPrerender
 *
 * Warning: This plugin requires view_user permissions! Admins have them automatically. Your Editors might not have them.
 */
 
$dateFormat  = $modx->getOption('manager_date_format',null,'d.m.Y');
$timeFormat  = $modx->getOption('manager_time_format',null,'H:i');
$offset_time = (int) $modx->getOption('server_offset_time',null,0);
$manager_week_start = (int) $modx->getOption('manager_week_start',null,0);

$selector = "modx-page-settings-right"; // see manager customization for more containers
$selector = "modx-resource-main-right";

$modx->controller->addHtml("
<script>
    // We are targeting the right column in the settings tab
    Ext.ComponentMgr.onAvailable('".$selector."', function(right) {

        right.on('beforerender', function() {
            // page is a reference to the whole form panel
            var page = Ext.getCmp('modx-panel-resource')
                // record is a reference to our resource fields
                ,record = page.record
            ;
            // How about a seperator?
            right.add({
                xtype : 'menuseparator',
                width : '100%',                
            });
            
            //right.add({ // Let's add our new field at the bottom of the column
            right.insert(0,{ //either insert add the end of the container or a specific container.
                 xtype: 'xdatetime'
                ,fieldLabel:        _('resource_createdon')
                ,description:       '<b>[[*createdon]]</b><br>'+_('resource_createdon_help')
                ,name:              'createdon'
                ,id:                'modx-resource-createdon'
                ,allowBlank:        false
                ,dateFormat:        '".$dateFormat."'
                ,timeFormat:        '".$timeFormat."'  
                ,startDay:          $manager_week_start
                ,dateWidth:         120
                ,timeWidth:         120   
                ,offset_time:       $offset_time
                ,value:             record.createdon                
                ,hiddenName:        'createdon'


            });
            
            // Let's add our new field at the bottom of the column
            //right.add({
            right.insert(0,{
                 xtype: 'modx-combo-user'
                ,name: 'createdby'
                ,hiddenName: 'createdby'
                ,value: record.createdby
                ,anchor: '100%'
                ,boxMaxWidth: 242
                ,layout: 'anchor'
                ,fieldLabel: _('resource_createdby')
            });            
        })
    });
</script>
"
);