Add example for Anonymous-IP database in README.md
Add example for Anonymous-IP database in README.md

cemoulto/GeoIP2-php,cemoulto/GeoIP2-php,g9007676/GeoIP2-php,g9007676/GeoIP2-php,Shemtek/GeoIP,maxmind/GeoIP2-php,maxmind/GeoIP2-php