title: Adding Jar dependency in gradle custom plugin
body: <p>Assuming all my Gradle plugin user going to have a MYAPP_HOME sys variable set in there system
  in MYAPP_HOME page i have a jar at $MYAPP_HOME/lib/mylib.jar</p>
  
  <p>i am writing my own plugin....</p>
  
  <p>I can find the MYAPP_HOME variable is set and fine the jar exists.. </p>
  
  <p>How can i add this jar dependency in my custom gradle plugin... ? when user runs my plugin say compileMyplugin my custom gradle plugin need to set the $MYAPP_HOME/lib/mylib.jar jar as compiler dependent </p>
  
  <p>How to do this any one help me ?</p>