title: How do I know if box collider 2d is touching another box collider?
body: <p>I'm developing a game 2D, I'm using <code>Unity 3D 5.6.1f1</code> with <code>C#</code> . 
  I have a <code>Collider Box 1</code> and   <code>Collider Box 2</code>.</p>
  
  <p>How do I know if <code>Collider Box 1</code> touch <code>Collider Box 2</code> ? </p>