Add spinner on load #452
Description
When pages are being loaded the tables are empty and the user can't know if the system is loading the data or there is no data at all saved. (Check customers-management section or time-entries).
We need to add a spinner when data is being retrieved in order to improve the UX
Acceptance Criteria
- Add a generic way to display a loading image
- Implement this mechanism in the following pages: time-entries, reports, customer-management, activities or find a way that it can work in all the app. (Probably using the ngrx state)