Document the underlying algorithm

Is there a document that specifies the algorithm behind LifeHash?

I know there are at least three reference implementations in various languages, listed below for completeness, however it requires a lot of effort to reverse engineer these:
* Swift -- ;
* C++ -- ;
* Python -- (probably the best source for reverse engineering as it's [one self-contained source file](https://github.com/BlockchainCommons/bc-lifehash-python/blob/master/lifehash/lifehash.py));

For example I was looking for a pure Rust based implementation but there is none. I might have tried to implement one in a weekend, but there is no specification to start from, and reverse engineering an already implementation is far from a weekend project. :)

Also, for completeness, the video linked in the repository does give some insight, but it doesn't contain all the actual details:

Commencez par la référence Python autonome située dans lifehash/lifehash.py, puis comparez-la aux implémentations Swift et C++ liées dans l’issue. Documentez l’algorithme complet, y compris les détails absents de la vidéo, afin qu’un autre développeur puisse implémenter LifeHash sans procéder à l’ingénierie inverse d’une bibliothèque existante.

Rédigé par le modèle d'indexation à partir du texte de l'issue.