Added ability to add/edit note fields in Magento Admin.

Block/Adminhtml/Form/Field/VendorMapping.php

@@ -0,0 +1,41 @@
+<?php
+namespace Shopkeeper\VendorNotes\Block\Adminhtml\Form\Field;
+
+use Magento\Config\Block\System\Config\Form\Field\FieldArray\AbstractFieldArray;
+use Magento\Framework\DataObject;
+
+class VendorMapping extends AbstractFieldArray
+{
+    /**
+     * Prepare rendering the new field by adding all the needed columns
+     */
+    protected function _prepareToRender()
+    {
+        $this->addColumn('vendor_name', [
+            'label' => __('Vendor Name'),
+            'class' => 'required-entry',
+            'style' => 'width:200px'
+        ]);
+        
+        $this->addColumn('note', [
+            'label' => __('Note'),
+            'class' => 'required-entry',
+            'style' => 'width:400px'
+        ]);
+        
+        $this->_addAfter = false;
+        $this->_addButtonLabel = __('Add Vendor Note');
+    }
+
+    /**
+     * Prepare existing row data object
+     *
+     * @param DataObject $row
+     * @throws \Magento\Framework\Exception\LocalizedException
+     */
+    protected function _prepareArrayRow(DataObject $row): void
+    {
+        $options = [];
+        $row->setData('option_extra_attrs', $options);
+    }
+}