Could add a PF Skeleton

[LiorKGOW]

In order to do this I can send a faster request to the serve to return the number of elements it contains in the DB
And then send a second request to get the elements (which should take longer)
Until the data is fetched from the server, we could present a skeleton with the correct number of elements,
instead of the current: Loading... (with a PF4 Spinner)
http://v4-archive.patternfly.org/v4/components/skeleton