User online status feature added

[AkshayGowda-repo]

• Added online_status column in user_data table:

ALTER TABLE user_data ADD COLUMN online_status BOOLEAN DEFAULT FALSE;

• Implemented backend routes to set user status online or offline based on login/logout events.
• Session expiration now triggers automatic status updates.

Related Issue: Closes #25

[AkshayGowda-repo]

Hey @Pudi-Sravan, can you review the changes.

[Pudi-Sravan]

Hey @AkshayGowda-repo, good try but where are you displaying the status and its not updating the bool to true when logged in the table when i checked,once kindly go through this and later update even the Readme file mention the changes required in the table.