Add Openskill rating system by choice

[Akamar]

Describe your suggested feature

You may know about TrueSkill rating system, which is excellent by its design (although more complex than Glicko). The accuracy of winning chances prediction is about 90%, and it can doing matches NxN, rather than just 1x1. Moreover, its rating scale uses real numbers from 0 to 50 and can be easily adapted for rating with "stars" on recommendation services.

There is a FOSS analog of the system, named Openskill, and it's also way faster. We have a Kotlin implementation of this algorithm:

https://github.com/brezinajn/openskill.kt

How about adding this into the app? It also will be useful if you want to use Rank-My-Favs as a sport ranker/predictor someday. User can be able to switch between rating systems to achieve a best outcomes for him personally.

Other details

No response

Acknowledgements

• [X] I have written a short but informative title.
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• [X] I have checked through the app settings for my feature.
• [X] I have searched the existing issues and this is a new one, NOT a duplicate or related to another open issue.
• [X] This is a single feature request, in case of multiple feature requests I will open a separate issue for each one (they can always link to each other if related)
• [X] This is not a question or a discussion, in which case I should have gone to lemmy.ml/c/rankmyfavs
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[dessalines]

I wouldn't be opposed, but this would require a lot of work, and I'm not sure what it improves on over glicko2. So I probably won't do it, but someone else could.