add output of the percentage of correct answers

console/migrations/m211025_065459_add_percent_correct_answers_column_to_user_questionnaire_table.php

@@ -0,0 +1,25 @@
+<?php
+
+use yii\db\Migration;
+
+/**
+ * Handles adding columns to table `{{%user_questionnaire}}`.
+ */
+class m211025_065459_add_percent_correct_answers_column_to_user_questionnaire_table extends Migration
+{
+    /**
+     * {@inheritdoc}
+     */
+    public function safeUp()
+    {
+        $this->addColumn('user_questionnaire', 'percent_correct_answers', $this->double());
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function safeDown()
+    {
+        $this->dropColumn('user_questionnaire', 'percent_correct_answers');
+    }
+}