1. Create this environment variable "ASPNETCORE_ENVIRONMENT" with this value: "Development" and restart your computer
2. Change the connection string: ContactsDatabase in appsettings.Development.json file
3. Run the project from VS or command line, the country table should be populated
4. Create state(optional), city, zip code and finally contact

Please note, I have integrated geolocation API, but it is not a good one, so usually it does not work