Custom formatter extension documentation

[jdeniau]

Hi,

I wanted to know if you are interested in a documentation about writing a custom formatter ? I did implement one myself, but I think there is no such documentation out in the wild, so I had a really hard time implementing it.

I tried to sum-up everything I learned in a blog post that I wrote here : https://julien.deniau.me/posts/2024-01-24-custom-behat-formatter

If you are interested, i am willing to adapt this blog post to integrate in the official documentation.

Thank you