docs: Add jiebaRS R binding link to README

[Yousa-Mirage]

Hi. I used jieba-rs to create a R language binding named jiebaRS and hope to add it to README 🤓. Thanks jieba-rs.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 83.47%. Comparing base (c62e0df) to head (a6ccadd).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #155   +/-   ##
=======================================
  Coverage   83.47%   83.47%           
=======================================
  Files          10       10           
  Lines        2063     2063           
=======================================
  Hits         1722     1722           
  Misses        341      341           

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