first standalone plugin commit

templates/States/select.php

@@ -0,0 +1,13 @@
+<?php
+/**
+ * @var \App\View\AppView $this
+ * @var iterable<\Cake\Datasource\EntityInterface> $states
+ */
+
+$this->setLayout('ajax');
+
+?>
+<option value="">Select a state</option>
+<?php foreach ($states as $stateId => $stateName): ?>
+<option value="<?= $stateId; ?>" <?= $this->request->getQuery('state_id') == $stateId ? 'selected="selected"' : ''; ?>><?= $stateName; ?></option>
+<?php endforeach; ?>