Using OCI8 Module to See OracleDB
That module provides a very basic API only; no UI, no methods to display/format data, and no integration with the Views module.

It currently provides developers with:


A database connection class for Oracle
A simple Oracle-specific version of db_query
A simple Oracle-specific version of db_query_range


and literally nothing else.

So yes, in order to see any data using this module, you're going to need to create your own module which uses the couple of query functions it provides, and displays the results in whatever way makes sense.

For something more automated, you could try the technique mentioned here to hook into Views and force it to use a different database for certain tables (which can theoretically be in an Oracle DB). I've never tried that so I can't comment on its effectiveness, or if it's genuinely even an option. Something tells me that you'd need a PDO connection to Oracle for that to work, but I might be wrong.

As an aside, the line you quoted from the readme looks like a TODO note; the maintainer is probably saying that the functionality hasn't been implemented yet, but that developers who want to make proper use of the module will probably find it beneficial to implement that per their requirements.