title: how to draw line with mouse clicks in elm?
body: <p>I am new to Elm and I really confused about the whole style and how it works</p>
  
  <p>I want to draw lines with mouse clicks. Those line should be end to end. it means that after the first 2 clicks, I can add line to the graph with every click. </p>
  
  <p>This should use sampleOn and foldp.</p>
  
  <p>I really have no idea how to do it, Could some one help me?</p>