title: How to add custom code analysis in ReSharper
body: <p>I'm new to ReSharper.
  For those who uses Resharper, is there a way I can add custom code analysis rules?</p>
  
  <p>For example I might have a rule say <em>All private variables should start with letter "m"</em>. How can I add this to Resharper so if I violate this, it can shows as a warning or an error?</p>