Add build types demo code.
Add build types demo code.

KarthicK10/AND_Project_4_BuildItBigger,KarthicK10/AND_Project_4_BuildItBigger,Sushant-M/Joke_Telling_App,DevDoug/AndroidNanoDegreeProjectFour,SethsApps/ud867,udacity/ud867,Wertros/GradleTutorial,udacity/ud867,DevDoug/AndroidNanoDegreeProjectFour,Sushant-M/Joke_Telling_App,Wertros/GradleTutorial,SethsApps/ud867