zaviagodev/frappe_states_and_cities ? reverse-engineered prompt

Build me a small Frappe app that loads a list of states and cities into a Frappe site during setup.

I want it to be easy to install, and when the app is added it should populate the site with the location data so it can be used for SaaS onboarding and basic setup flows. Keep it simple and reliable, and make sure it fits naturally into a normal Frappe app.

Please include the code needed to load the data, the packaging files, and any setup steps a site admin would need to follow. If you need to check the latest Frappe docs or best practices, go ahead and look them up online.

The main goal is just to have a clean app that can seed states and cities into the site without extra hassle, and be ready to use in a real Frappe project.