You can do it same as the below module:

https://github.com/OCA/l10n-switzerland/tree/12.0/l10n_ch_zip

They create hooks.py to import from csv and remember the below:

 1- Change the path and file name (data/res.city.csv) of your csv file 

 2- Change module name instead of "l10n_ch_zip" in convert method.

from odoo.tools import convert_file

def import_csv_data(cr, registry):

    """Import CSV data as it is faster than xml and because we can't use

    noupdate anymore with csv"""

    filenames = ['data/res.city.csv']

    for filename in filenames:

        convert_file(

            cr, 'l10n_ch_zip',

            filename, None, mode='init', noupdate=True,

            kind='init', report=None,

        )


def post_init(cr, registry):

    import_csv_data(cr, registry)

 then in __init__.py call the post_init as below:

from .hooks import post_init

then in __manifest__.py added the below:

 'post_init_hook': 'post_init',