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:

Comienza con la referencia de Python autocontenida en lifehash/lifehash.py y compárala después con las implementaciones en Swift y C++ enlazadas en el issue. Documenta el algoritmo completo, incluidos los detalles que faltan en el vídeo, para que otro desarrollador pueda implementar LifeHash sin tener que aplicar ingeniería inversa a una biblioteca existente.

Escrito por el modelo de indexación a partir del texto del issue.