Expanding collection of Readability Scores

[BradKML]

There are popular repos that can be integrated with extra scores (e.g. ARI):

• https://github.com/shivam5992/textstat (definitely deserves support as it is multilingual)
• https://github.com/cdimascio/py-readability-metrics
• https://github.com/mmautner/readability and https://github.com/wimmuskee/readability-score