Initial commit
working calculator with basic functionality
Feature1: User changes the input amount and updated tip is reflected automatically
Feature2: User can select custom tip percentage if desired
Working tip calculator:

1) Feature: User changes the total amount and updated tip is reflected automatically
2) Feature: User can select how many ways to split the tip
3) Feature: Improve user interface
   a) Use Crouton instead of Toast for user error warning
modify soft keyboard next to done and add licecap