JS: add test case

Author: Esben Sparre Andreasen

javascript/ql/test/query-tests/filters/ClassifyFiles/not-multiple-licenses.js

@@ -0,0 +1,9 @@
+/**
+ * The MIT License (MIT)
+ */
+/**
+ * The user needs to accept the licence.
+ */
+function hasAcceptedLicense(){
+    // ...
+}