Add Account model file
Add Transfer model file
Add Fee interface file
Add FeeA which implements Fee interface
Add new method calculateFee to Transfer
Add Transfer test file
Add Fee test file
Add shouldCalculateFeeA method test to ensure the properly result
Add FeeB which implements Fee interface
Add implementation to calculate method of FeeB
Refactor at FeeA and FeeB classes
Add 2 test methods in FeeB to ensure the properly result with dateSchedule <= 30 days or > 30 days
Add FeeC which implements Fee interface
Add implementation to calculate method of FeeC
Add Eclipse files
Add FeeD which implements Fee interface