Notification feature

[mitalirs]

Related Issuse

• no notification feature

Closes: #435

Describe the changes you've made

1. added notification model
2. added getNotifications route in the new controller file
3. added the corresponding route in the notification route file

Checklist:

• [x] My code follows the style guidelines of this project.
• [x] I have performed a self-review of my own code.
• [x] I have commented my code, particularly in hard-to-understand areas.
• [x] I have made corresponding changes to the documentation.(Specially for Backend)
• [x] My changes generate no new warnings.

Screenshots

Original	Updated
no getNotifications route

[codewithvk]

@mitalirs Resolve conflict as well.

[mitalirs]

done

@mitalirs Resolve conflict as well.