title: OHLC chart draw a line on from one point to another
body: <p>I am developing Andrews'Pitchfork on an OHLC chart using High chart library. I have plot the graph but i am not able to find a way to draw a line on the chart. How can this be achieve. </p>
  
  <p>Any help would be highly appreciated.</p>
  
  <p>The graph looks like this. I have plot the graph but how to draw line does high chart gives this ability ?
  <a href="https://i.stack.imgur.com/PTD5M.png" rel="nofollow noreferrer">Andrew PitchFork</a></p>