Introduce Zsh Starter recipe

[pkosiec]

Resolves #13

[codecov]

Codecov Report

Merging #27 into master will increase coverage by 0.3%.
The diff coverage is 79.31%.

@@            Coverage Diff            @@
##           master      #27     +/-   ##
=========================================
+ Coverage   90.68%   90.99%   +0.3%     
=========================================
  Files           8        8             
  Lines         204      211      +7     
=========================================
+ Hits          185      192      +7     
  Misses         13       13             
  Partials        6        6

Impacted Files	Coverage Δ
pkg/recipe/recipe.go	100% <100%> (ø)	⬆️
pkg/installer/installer.go	100% <100%> (ø)	⬆️
pkg/shell/shell.go	72.91% <72.72%> (+4.62%)	⬆️

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