Add an extension module for Doobie

[alonsodomin]

No description provided.

[codecov-io]

Codecov Report

Merging #149 into master will increase coverage by 0.12%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #149      +/-   ##
==========================================
+ Coverage      91%   91.12%   +0.12%     
==========================================
  Files          69       70       +1     
  Lines        1190     1195       +5     
  Branches       37       31       -6     
==========================================
+ Hits         1083     1089       +6     
+ Misses        107      106       -1

Impacted Files	Coverage Δ
.../doobie/src/main/scala/cron4s/doobie/package.scala	100% <100%> (ø)
.../shared/src/main/scala/cron4s/parsing/parser.scala	100% <0%> (+1.75%)	⬆️

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