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:

Start with the self-contained Python reference at lifehash/lifehash.py, then compare it with the Swift and C++ implementations linked in the issue. Document the complete algorithm, including details absent from the video, so another developer can implement LifeHash without reverse engineering an existing library.

Scritto dal modello di indicizzazione a partire dal testo della issue.