Implement in app Notifications for upcoming tasks/appointments

### Is your feature request related to a problem?

- [x] Yes, it is related to a problem

### Describe the feature you'd like

## 🌟 Feature Description

## 🔍 Problem Statement

## 🎯 Expected Outcome

## 📷 Screenshots and Design Ideas

## 📋 Additional Context

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- [x] I agree to follow this project's Code of Conduct
- [ ] I want to work on implementing this feature