Add HashRing to the glossary

We need to add HashRing to the glossary, there are some contents that mention it on passing and most of the readers and translators think it is a typo of hashing, but it is not:

14:19 < nina13[m]> hi! There is a glossary term to translate "hashring" (https://hosted.weblate.org/translate/tor/glossary/ru/?checksum=3b2b6b707f90ff59) 
currently it is translated in Russian and other eastern european languages as "hashing". So I wonder is it just "hashing" or hashRing like in Rust (https://docs.rs/hashring/latest/hashring/)

14:32 < = trinity-1686a> "hashing" wouldn't be a good translation. Scouting the internet, I found two instances of "Хэшринг" which seems more 
accurate, I couldn't find any other translation that seemed correct (but I don't speak a word of russian)

14:38 < trinity-1686a> it's related to the concept of "consistent hashing". There is a picture on 
https://en.wikipedia.org/wiki/Consistent_hashing#Basic_technique which explain why the name hash+ring (you hash something, treat the 
result as a position on a ring. To know where to store your thing, you walk on the ring until you find a server)