Add simple button in toolbar.

I need to add a new item to the toolbar - simple button for adding a simple table with some text in two fields. No dialog windows, no dinamic content. Just simple table.
I know that i must use plugins. But there is no sample with this type of buttons.
How can i do it?

Code to adding:
<table>
<tr>
<td>
Sample
</td>

<td>
Sample
</td>
</tr>
</table>