Added ability to record and display entries, no save yet.

Todo:
 - implement save and load functionality
 - implement variable entry height in the list for multiple lines or
 larger text sizes
 - Add option to change date format
 - Add option to display occupied dates or empty dates
 - Set the program to do something after adding entries, delete the
 text in the text field, highlight and move the cursor to the date 
 field, highlight text in the text field without deleting
 - Add the ability to remove entries