docs: add README status badges

Author: jgarciab

README.md

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 # ReMoDe: a Python library for efficient mode detection in ordinal data distributions.
 
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 `ReMoDe` (Recursive Mode Detection) is a Python library designed for the robust detection of modes in ordinal data distributions. It uses statistical tests, including Fisher's exact test and binomial tests, to determine if a given maximum in a data distribution is a true local maximum.
 
 **Are you an `R` user?** Please find the `R` version here: https://cran.r-project.org/web/packages/remode/index.html