MassInstallAction: Install the Documenter workflow on this repository

[timholy]

This pull request sets up the Documenter workflow on this repository.

[codecov-io]

Codecov Report

Merging #84 (7855c67) into master (21fe124) will increase coverage by 2.61%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master      #84      +/-   ##
==========================================
+ Coverage   87.41%   90.03%   +2.61%     
==========================================
  Files           1        1              
  Lines         302      291      -11     
==========================================
- Hits          264      262       -2     
+ Misses         38       29       -9     

Impacted Files	Coverage Δ
src/IterTools.jl	90.03% <0.00%> (+2.61%)	⬆️

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[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.03%. Comparing base (21fe124) to head (7855c67).
Report is 78 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #84      +/-   ##
==========================================
+ Coverage   87.41%   90.03%   +2.61%     
==========================================
  Files           1        1              
  Lines         302      291      -11     
==========================================
- Hits          264      262       -2     
+ Misses         38       29       -9     

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