Add copyright

Signed-off-by: Denis Kopylov <[email protected]>

Author: Den4ik

dev/tests/static/framework/Magento/CodeMessDetector/resources/rulesets/unusedcode.xml

@@ -1,5 +1,10 @@
 <?xml version="1.0"?>
-
+<!--
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+-->
 <ruleset name="Unused Code Rules"
          xmlns="http://pmd.sf.net/ruleset/1.0.0"
          xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"