fixed framework path of req checker + notice on wrong path

git ignore composer.lock

.gitignore

@@ -0,0 +1 @@
+composer.lock

requirements.php

@@ -11,7 +11,14 @@
  */
 
 // you may need to adjust this path to the correct Yii framework path
-$frameworkPath = dirname(__FILE__) . '/../../yii';
+$frameworkPath = dirname(__FILE__) . '/vendor/yiisoft/yii2/yii.';
+
+if (!is_dir($frameworkPath)) {
+	echo '<h1>Error</h1>';
+	echo '<p><strong>The path to yii framework seems to be incorrect.</strong></p>';
+	echo '<p>You need to install Yii framework via composer or adjust the framework path in file <abbr title="' . __FILE__ . '">' . basename(__FILE__) .'</abbr>.</p>';
+	echo '<p>Please refer to the <abbr title="' . dirname(__FILE__) . '/README.md">README</abbr> on how to install Yii.</p>';
+}
 
 require_once($frameworkPath . '/requirements/YiiRequirementChecker.php');
 $requirementsChecker = new YiiRequirementChecker();