title: R plotly total count
body: <p>I have a plotly pie cart and a bar chart on my shiny dashboard and I was wondering if there is way to display 'total count' somewhere on the chart. For instance,</p>
  
  <pre><code>Animals &lt;- c("giraffes", "orangutans", "monkeys")
  SF_Zoo &lt;- c(20, 14, 23)
  data &lt;- data.frame(Animals, SF_Zoo)
  plot_ly(data, x = ~Animals, y = ~SF_Zoo, type = 'bar', name = 'SF Zoo')
  </code></pre>
  
  <p>I want to display 'Total Count = 57' in the plot somewhere </p>
  
  <p>thanks,</p>
  
  <p>Manoj Agrawal</p>