Enhancement - timesheet report

- Version 1 of the timesheet report.  Displays a specified number
  of weeks tasks, both started and completed.

html/advanced.html

@@ -231,9 +231,16 @@ Year Month     Added Completed Deleted Net
                   report.  It shows a colored bar graph and legend.
                 </p>
 
-                <strong>% task timesheet</strong>
+                <strong>% task timesheet 2</strong>
                 <p>
-                  ???
+                  The timesheet report shows a list of tasks completed and started
+                  during a one-week period.  In the example above, 2 weeks of tasks
+                  are shown.
+                </p>
+                <p>
+                  By default, the report starts on a Monday.  To override this
+                  value, add an entry to your .taskrc file like this:
+                  <pre><code>weekstart=Sunday</code></pre>
                 </p>
 
                 <strong>% task calendar</strong>