add crane and docs

[marouenbg]

No description provided.

[codecov]

Codecov Report

Merging #235 (14538b2) into devel (809e28b) will decrease coverage by 11.32%.
The diff coverage is 0.00%.

❗ Current head 14538b2 differs from pull request most recent head 7ed368a. Consider uploading reports for the commit 7ed368a to get more accurate results

@@             Coverage Diff             @@
##            devel     #235       +/-   ##
===========================================
- Coverage   64.75%   53.42%   -11.33%     
===========================================
  Files          16       17        +1     
  Lines        1708     2070      +362     
===========================================
  Hits         1106     1106               
- Misses        602      964      +362     

Impacted Files	Coverage Δ
R/CRANE.R	0.00% <0.00%> (ø)

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