registerFont does not work without init
## About this issue

I wasn't able to register my custom font by following the README here: https://github.com/mikepenz/Android-Iconics?tab=readme-ov-file#register-fonts
To make this work, I also had to call init before:
```
Iconics.init(applicationContext)
```

Shouldn't this be added to the README? I can of course create a pull request for it, but I just wanted to double check with you.