Add login logout

Description

This MR adds the login and logout feature to the existing signup feature it act as signin feature. The change extends the existing feature to provide a more complete user experience.

Key feature

• Securely access their information
• Add more Privacy

Youtube Demo Link of current MR -https://www.youtube.com/watch?v=zNAkTU-9ruM&ab_channel=YogendraJhala

Fixes # (issue)

Type of change

Please mark the options that are relevant.

• Updated UI/UX
• Improved the business logic of code
• Added new feature
• Other

Checklist:

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings