Unclear where to put configuration

[lissomliksom]

The current readme-file says:

For extra protection, you may use the PanConfiguration::allowedAnalytics method to whitelist the analytics you want to track. This way, only the analytics you've whitelisted will be stored in your database.

It also provides this code:

use Pan\PanConfiguration;

public function register(): void
{
    PanConfiguration::allowedAnalytics([
        'tab-profile',
        'tab-settings',
    ]);
}

However, it is unclear where this code should live.

Is it in a config-file?

I think the readme.md could benefit from this being clearer.