title: Code Editor API (with line number) and code highlighter
body: <p>How to get and open a file <strong>In an Editor with Line Number</strong>
  as Below:</p>
  
  <p>So, my text File could open in the editor below and can save my changes on edit.</p>
  
  <pre><code>   ---------------------------------------------------------
   1 |                                                       |
   2 |                                                       |
   3 |                                                       |
   4 |                                                       |
   5 |                                                       |
     ---------------------------------------------------------
  </code></pre>
  
  <p>Is there any Code Editor(API/Plugin) available online for doing this?</p>