Add audit log with tamper detection

[Entity069]

Related Issue

Closes #39

Type of Change

• New Feature
• Bug Fix
• Code Refactor
• Documentation Update
• Other (please specify):

Description of Change

Implemented a feature for audit logs and tamper detection with the logs

Implementation Details

• Implemented a ActionLogger class which creates a .txt log files and stores all action of the user
• Used sha256 hashes for integrity from hashlib library
• It maintains integrity in the following way: the first entry of the log GENESIS_ENTRY , has a sha256 hash of the text GENESIS_ENTRY; the hashes of the next following lines are generated by taking the hash of the current log entry (date and small description of the task) + hash of the last entry
• Added a custom exception called IntegrityError which checks for tampering with the log files. If a tampering is detected then IntegrityError is raised and the script exits
• The main.py file now checks for the tampering at the beginning before adding/extracting any data
• Added an option to print log in main.py