android: Add Fragment Manager example

Signed-off-by: Filipe Leuch Bonfim <flb09@inf.ufpr.br>
android: Add To Do List example

Signed-off-by: Filipe Leuch Bonfim <flb09@inf.ufpr.br>
android: Add simple fragment implementation example

Signed-off-by: Filipe Leuch Bonfim <flb09@inf.ufpr.br>