title: How to add the Signed-off-by field in the git patch
body: <p>I'm generating a git patch. And then I want to send it to the project maintainer.</p>
  
  <p>I want to mark my Name and my email address as <code>signed-off-by</code> in the git patch</p>
  
  <p>How to do it ? in order that the project maintainer get the <code>signed-off-by</code> field with my name and email address.</p>