Add little loading icon on the events calendar when waiting for api request

[SamuelmdLow]

Sometimes the request takes a while and during that time the user might be confused why there is nothing on the calendar.

You can do this with usestate where the loading animation is rendered conditionally on that state and the api request returning changes the state to false

[Nishim12]

https://medium.com/@cabhishek712/implementing-a-loader-loading-spinner-in-react-function-components-950eef0f4253
This article is useful for adding a loader.