add cran data and corpus

[mpadge]

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[codecov]

Codecov Report

Attention: Patch coverage is 20.83333% with 19 lines in your changes missing coverage. Please review.

Project coverage is 84.43%. Comparing base (d2dfbbf) to head (5e6dd8e).
Report is 6 commits behind head on main.

Files with missing lines	Patch %	Lines
R/cache.R	19.04%	17 Missing ⚠️
R/similar-pkgs.R	33.33%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #12      +/-   ##
==========================================
- Coverage   85.73%   84.43%   -1.31%     
==========================================
  Files           9        9              
  Lines         610      623      +13     
==========================================
+ Hits          523      526       +3     
- Misses         87       97      +10     

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