TO-DO List screen : a. Activity should extend the AppCompactActivity class.   
                      b. The layout should have a ListView in the XML and the same XML page should be set as the content View in 
                         the onCreate() method.   
                      c. Each list item will have 3 TextViews and an ImageView.    
                                     I. TextView 1: For the Title of the To-Do Task.   
                                     II. TextView 3: Description of the To-Do Task.   
                                     III. TextView 2: Timestamp or due date of the To-Do task.   
                      d. The entire list item should be sorted in ascending order based on the due date of each task.
                      
 Create options menu and dialog : a) Two menu items has to be created and these items have to be placed on the ActionBar.   
                                  b) Upon click on the Add item (plus icon) a dialog should pop-up asking for the details from the 
                                     user.
                                  c) The above dialog should contain two EditTexts, a DatePicker and two Buttons.   
                                  d) The EditTexts should at least have a minimum characters entered (Validation has to be taken care).   
                                  e) Upon click on save button the details has to be saved to the database.   
                                  f) Upon clicking on the list item, an AlertDialog box should be popped out with the prepopulated 
                                     values of the list item clicked.   
                                  g) If the changes are made to the list item and the same has to reflected in the ListView with 
                                     the database.     
                                  h) Upon the Long clicked on the List Item, items have to be marked as the completed task "1" 
                                     i.e. if in database the KEY_STATUS for that particular task is marked as zero and vice versa.   
                                  i) Upon the click of second menu item a new Activity has to be display which will be having a task 
                                     list of only completed task.  
                                  j) In the completed task list activity you should be able to delete the task on long press.