If you do not understand any of the terms in this description and/or do not understand the requirements then do not apply. It will waste both of our time as you then clearly are not experienced enough to complete the task on time and in a good manner.
Create an empty PWA (install able to home screen) with a periodic background sync Web API in a service worker that periodically connects to an asp.net 6 (C#) controller using a GET method. Both will be hosted on kestrel in the same visual studio solution
The controller responds with a boolean that changes state on each request.
On the client create a Notification when the controller returns true.
Delivery time: Max 2 days after project start
Deliverable will be a visual studio solution with a single asp.net
6 project with 1 controller and 1 html page with the required functionality