title: Inserting and saving xml using Linq to XML
body: <p>If i have an XML file <code>settings.xml</code> like below </p>
  
  <pre><code>&lt;Root&gt;
      &lt;First&gt;
      &lt;/First&gt;
  &lt;/Root&gt;
  </code></pre>
  
  <p>I Load the XML first using <code>XDocument settings = XDocument.Load("settings.xml")</code></p>
  
  <p>How should I insert a XML node inside the node <code>First</code> and save it using LINQ-to-XML?</p>