Add frequency data

[hugolpz]

Phase 1 : Unilex data

Frequency lists will be fundamental to your algorithms. This field is known for data of very variable quality. So you may want a code which can easily change input data as cleaner lists may be found later on the web. Some key projects to create your demonstrators :

• https://github.com/unicode-org/unilex/tree/main/data/frequency -- row data from Google smart input suggestion project
• https://github.com/lingua-libre/unilex-extended/tree/main/frequency-sorted-count -- same, cleaner. FR, EN, AR, JA, ZH are there. There are also better frequency lists but I have to look for them online.

I (Yug) will add Unilex data to the repository.

Phase 2 : academic grade lists

I (Yug) will add Subtlex data to the repository.

Progresses

• [x] Phase 1: Unilex https://github.com/hugolpz/WeSpeaxExos/commit/beec672dfd6226582643a6020dcac2a974fcc596 : ar, fr, hi, ja. Missing: en, zh.
• [x] Phase 2: Subtlex

[hugolpz]

English

• [x] Subtlex-US

Chinese

• [x] Subtlex-CH

[hugolpz]

@Sarveshmeenwa , depending of your findings and as you see fit, this issue could be reopen.