title: Add rows before the column header using excel.js module + node
body: <p>I am trying to create xslx file using excel.js module in node.js. I was able to create the columns and add its values. But, I need to insert some rows before the columns headers, where I can have some descriptions. How can I do that?</p>
  
  <p><a href="https://i.stack.imgur.com/bCnZa.png" rel="noreferrer"><img src="https://i.stack.imgur.com/bCnZa.png" alt="I need something like this "></a></p>
  
  <p>Any help will be appreciated</p>
  
  <p>The code I tried is</p>
  
  <pre><code>     var worksheet = workbook.getWorksheet(1);
      worksheet.mergeCells('A1:B1');
      var row = worksheet.getRow(1);
      row.getCell(1).value =' Hello, World!'; 
     // ... merged cells are linked 
      worksheet.getCell('A1').value = 'PI';
      worksheet.columns = [
          {header: 'Id', key: 'id', width: 10},
          {header: 'Name', key: 'name', width: 32},
          {header: 'complexity', key: 'complexity', width: 10},
          {header: 'hours', key: 'hours', width: 10},
          {header: 'cost', key: 'cost', width: 10}
      ];
       worksheet.addRow({name:'m', complexity: 'd', hours:5, cost: 7});
  </code></pre>