Add sample for COSE.

[dajiaji]

No description provided.

[codecov]

Codecov Report

Merging #139 (12a6c3d) into main (7f06449) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #139   +/-   ##
=======================================
  Coverage   99.82%   99.82%           
=======================================
  Files          26       26           
  Lines        2303     2307    +4     
  Branches      604      606    +2     
=======================================
+ Hits         2299     2303    +4     
  Misses          4        4           

Impacted Files	Coverage Δ
cwt/algs/ec2.py	99.08% <100.00%> (+<0.01%)	⬆️
cwt/algs/okp.py	98.95% <100.00%> (+0.01%)	⬆️

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