title: Counting cells per Date
body: <p>I have a database of hotel rooms availability by date. Each day some hotels were available (Availablity = T) and some were not (Availablity = F).
  I am looking for a way to count the number of Trues and Falses per date.
  Initially, the dataframe looks like this:</p>
  
  <pre><code>Room ID   Date    Availablity 
  112      1/1/19       T
  112      2/1/19       F
  112      3/1/19       F
  113      1/1/19       F
  113      2/1/19       T
  114      1/1/19       T
  </code></pre>
  
  <p>I want to count the number of times each date has the value of True and False and then to make a plot of occupancy per data over the year.
  Namely, a datefarme that looks like this:</p>
  
  <pre><code>Date     num of Ts    num of Fs
  1/1/19      #             #
  2/1/19      #             #
  3/1/19      #             #
  </code></pre>
  
  <p>Thanks for the help!</p>