Add ListviewCustomActivity

To demonstrate the use of a custom adapter of ListView widget. Createing
a class extending BaseAdapter class and setting it to adapter of a
ListView, that's all !
Revert "Add ListviewCustomActivity"

This reverts commit 2c96625310403c802523d40356d4d1cd82b5677d.
Revert "Revert "Add ListviewCustomActivity""

This reverts commit 0fd99c5d88a1d4954b795608ee665320011a9ef3.
Revert "Revert "Revert "Add ListviewCustomActivity"""

This reverts commit d42e3cf6589204ff23fd863d4eb69c31cf39934b.