Docs https://docs.google.com/document/d/1lK8pko8h8AIDVete66FLtw5kJzlE280xOESJePTOALk/edit#
Assumptions
- Password for Account Holders and Branch Managers to be set using sudo passwd command before logging in.
- Number of days in a month assumed to be 30 for calculating average of expenditure.
- genSummary script shows the summary of current month of the account holders.