title: ggplot across multiple categories
body: <p>for the below data, can we plot ggplot across categories as shown below. Basically y axis is the count of customers across Months</p>
  <pre><code>df
  Date    App Customers
  Jan-01  A   Cust1
  Feb-01  B   Cust2
  Mar-01  A   Cust1
  Apr-01  B   Cust2
  May-01  C   Cust1
  </code></pre>
  <p><a href="https://i.stack.imgur.com/IrQ7d.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/IrQ7d.png" alt="enter image description here" /></a></p>