Create functions to interrogate data, variables, dates etc -- something that creates a metadata

[dbarneche]

A novice user who does not know much about eReefs will be lost about the types of data that are out there.
It would be nice to create a function which scrapes exisiting metadata from netCDF files, and provides a table to users with things like:

• spatial coverage and level of aggregation
• temporal coverage and level of aggregation
• variables and their string names

The above should help people navigate the nuances of the multiple products.

Tentative name suggestions for such function: navigate_ereeefs_data or interrogate_ereeefs_data