title: How to send attachment in slack bot using SlackClient for node.js
body: <p>I want to send image, text and bullet point with different colours. I am only able to send back message using
   <code>slackClient.sendMessage(botSays(parsedResp, witError, message) , message.channel);</code></p>
  
  <p>But I don't know how to send attachment. Any help will be appreciable</p>
  
  <p>Thanks</p>