create a basic app

The accounting firm hires you to build an application to keep track of their clients with the option to inform
their clients about their filing periods. The company would like to set a schedule for each client and send an
automatic notification, either email or SMS, before the filing due date

The application you are building must have the following management modules:
• Clients Manager – To manage client's information
Adding a new client
Modifying the client's information
Update status (inactive or active)
• Notification Manager – this module provides functionalities to
Add new notifications type (email, SMS, Push Notifications,…)
Modify a notification – update status (enable /disable) and update notifiction name.
• Client's Notification Manager - managing clients' notification types and their frequency.
Manage client’s notifications (add / update)
Change status of a client's notifications. (enabled / disabled)
• Employee – Manage company's employee
Add a new employee
Modify the employee information
Update status (inactive or active)