Add ball counter to the webpage for debugging auto

Change-Id: I32f2686f42bc1b68f6b8612ee7c0eae1efedde20
Signed-off-by: Austin Schuh <austin.linux@gmail.com>
diff --git a/y2020/www/field.html b/y2020/www/field.html
index e37d810..d3f5810 100644
--- a/y2020/www/field.html
+++ b/y2020/www/field.html
@@ -68,6 +68,10 @@
           <td>Right Accelerator</td>
           <td id="right_accelerator"> NA </td>
         </tr>
+        <tr>
+          <td>Balls shot </td>
+          <td id="balls_shot"> NA </td>
+        </tr>
       </table>
 
       <table>