title: Create JSON from the List using Json4s
body: <p>I have list of elements containing product name 
  <code>val productList = List[String]</code> with values as <code>product1,product2,product3</code></p>
  
  <p>now I need to create a Json from the list as</p>
  
  <pre><code>{
     "ProductName":["product1","product2","product3"]
  }
  </code></pre>
  
  <p>how can I achieve this using scala json4s framework.</p>