function to read the TimeSeries US detailed data
covid19.US.data(local.data = FALSE, debrief = FALSE, acknowledge = FALSE)
TimeSeries dataframe with data for the US
boolean flag to indicate whether the data will be read from the local repo, in case of connectivity issues or data integrity
boolean specifying whether information about the read data is going to be displayed in screen
boolean flag to indicate that the user acknowledges where the data is coming from. If FALSE, display data acquisition messages.