csv for `openstack_gender` missing?

Hi @valeriocos and other contributors.
I was exploring this project, and noticed in `openstack_gender.py` study, the CSVs to import are missing (ref [here](https://github.com/chaoss/grimoirelab-cereslib/blob/09b02478e4a594bf62148356914a64f4828b7c0d/examples/openstack_gender.py#L198)). Can I get some help on this. Do I have to extract the csvs from a source or something?

I would love to contribute to the project, the way git commits are enriched in `areas_code` study was very intuitive. I did see some TODOs and incomplete code, will try to fix those and add some tests to improve coverage, please inform me if there is any other requirement or work that I could help with. Would love to do that too.