Add example data

[paleolimbot]

wk::wk_plot(wk::wk_example())

^{Created on 2022-09-21 by the reprex package (v2.0.1)}

[codecov-commenter]

Codecov Report

Base: 98.96% // Head: 98.96% // Increases project coverage by +0.00% 🎉

Coverage data is based on head (f72855c) compared to base (93d9362).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #155   +/-   ##
=======================================
  Coverage   98.96%   98.96%           
=======================================
  Files          74       75    +1     
  Lines        5198     5213   +15     
=======================================
+ Hits         5144     5159   +15     
  Misses         54       54           

Impacted Files	Coverage Δ
R/data.R	100.00% <100.00%> (ø)
R/plot.R	100.00% <100.00%> (ø)
src/sfc-writer.c	98.88% <0.00%> (+<0.01%)	⬆️

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