title: How to include another root project in settings.gradle
body: <p>I have a 2 root projects in gradle one main root project1 from where I invoke gradle build and has settings.gradle which includes subprojects to build</p>
  
  <p>Another root project2 where I have settings.gradle which includes subprojects to build</p>
  
  <p>Rootproject1
  build.gradle
  settings.gradle</p>
  
  <p>Rootproject2
  build.gradle
  settings.gradle</p>
  
  <p>I want to inlcude Rootproject2 in my Rootproject1 settings.gradle file so that from Rootproject1 (gradle build) should build Rootproject1 as well as  Rootproject2 </p>
  
  <p>include/inlcudeFlat -- it is relative to rootproject </p>