how can we insert index column(serial no's) and how to applay sortiing and searching to that column

sandyskopic

<tbody>
    <tr>
        <td>1</td>
        <td>Tiger Nixon</td>
        <td>System Architect</td>
        <td>Edinburgh</td>
        <td>61</td>
        <td>$320,800</td>
    </tr>
    <tr>
        <td>2</td>
        <td>Garrett Winters</td>
        <td>Accountant</td>
        <td>Tokyo</td>
        <td>63</td>
        <td>$170,750</td>
    </tr>
    <tr>
        <td>3</td>
        <td>Ashton Cox</td>
        <td>Junior Technical Author</td>
        <td>San Francisco</td>
        <td>66</td>
        <td>$86,000</td>
    </tr>
    <tr>
        <td>4</td>
        <td>Cedric Kelly</td>
        <td>Senior Javascript Developer</td>
        <td>Edinburgh</td>
        <td>22</td>
        <td>$433,060</td>
    </tr>
    <tr>
        <td>5</td>
        <td>Airi Satou</td>
        <td>Accountant</td>
        <td>Tokyo</td>
        <td>33</td>
        <td>$162,700</td>
    </tr>
    <tr>
        <td>6</td>
        <td>Brielle Williamson</td>
        <td>Integration Specialist</td>
        <td>New York</td>
        <td>61</td>
        <td>$372,000</td>
    </tr>

</tbody>