Add example gifs to README

Author: lcdsmao

README.md

@@ -15,7 +15,9 @@ Easily create `TabLayout.Tab` animations that sync with the scrolling progress o
 
 ## Demo
 
-<img src="art/demo.gif" width="30%">
+|[Tab](sample/src/main/java/jp/co/cyberagent/android/tabanimationsample/TextTabActivity.kt)|[Indicator](sample/src/main/java/jp/co/cyberagent/android/tabanimationsample/IndicatorActivity.kt)|[Bottom Navigation](sample/src/main/java/jp/co/cyberagent/android/tabanimationsample/BottomNavigationActivity.kt)|
+|-|-|-|
+|<img src=art/demo.gif width=600 />|<img src=art/demo_indicator.gif width=600 />|<img src=art/demo_bottom_navigation.gif width=600 />|
 
 ## Usage