Refactor data_entry.py and add data entry functions

Author: Wambaforestin

Personal_Finance_Tracker/data_entry.py

@@ -1,11 +1,16 @@
 from datetime import datetime
 
 date_format = "%d-%m-%Y"
+
 categories = {
     "I": "Income",
     "E": "Expense"
 }
 
+""" 
+creating all data entry functions for the user to input the data
+"""
+
 def get_date(prompt, allow_default=False):
     date = input(prompt)
     if allow_default and not date: