AppIntro (OnBoard) Screen - Kotlin
          Introduction:   App Intro/Onboard screen is mainly to display the key features of our app to users while launching it, in a sweet way. Let's do that simply with TabLayout, ViewPager and its PageTransformer.    Design:     slide_page.xml    Desgin this layout with ViewPager and TabLayout to begin with.    <?xml version= "1.0"  encoding= "utf-8"? > <RelativeLayout xmlns:android= "http://schemas.android.com/apk/res/android"      xmlns:app= "http://schemas.android.com/apk/res-auto"      android: id = "@+id/introLayout"      android:layout_width= "match_parent"      android:layout_height= "match_parent" >      <android.support.v4.view.ViewPager         android: id = "@+id/viewPager"          android:layout_width= "match_parent"          android:layout_height= "match_parent"          android:layout_above= "@+id/tabLayout"  />       <android.support....