Assignment 2 journal app using cobra cli

[pratikpjain]

Created cobra-cli journal-app
Features added:

1. Login/Signup feature [Data stored in authData.txt in encrypted form]
2. adding new entry [Data stored in journalData.txt in encrypted form]
3. used cobra-cli
4. Used encryption-decryption for saving into the files
5. Added the necessary limits and error-handling
6. Added the bonus requirement [for directly adding entry at time of login]
7. After login/signup user is given a prompt to select which action to perform [add new entry or list all the entries]

implemented commands

journal signup --username <username> --password <password>
journal entry --add <new_entry> --username <user_name> --password <password>
journal login --username <user_name> --password <password>