Add thead and tbody to the createTable function (#58)

The two thead and tbody put the header row and body rows into groups. This is not required but can improve accessibility for screen readers and can help with styling for libraries like bootstrap

Author: Criptic

sdk/va-report-components/examples/getSelectedData.html

@@ -60,8 +60,10 @@ <h1>Currently selected data:</h1>
       const tableDiv = document.getElementById("tableDiv");
       const table = document.createElement("table");
 
+      const tableHeader = document.createElement("thead");
       const headingRow = document.createElement("tr");
-      table.appendChild(headingRow);
+      tableHeader.appendChild(headingRow)
+      table.appendChild(tableHeader);
 
       // Processing column names
       for (const column of dataSet.columns) {
@@ -71,10 +73,12 @@ <h1>Currently selected data:</h1>
         headingRow.appendChild(heading);
       }
 
+      const tableBody = document.createElement("tbody");
+      table.appendChild(tableBody);
       // Processing each row of data
       for (const dataRow of dataSet.data) {
         const row = document.createElement("tr");
-        table.appendChild(row);
+        tableBody.appendChild(row);
 
         // Processing each data value in the row
         for (const dataValue of dataRow) {