Add pgns command

[athos]

• Added pogonos.main, which uses babashka.cli to parse the command-line args
• Set up bb.edn in order for bbin to install the pgns command

[codecov]

Codecov Report

Base: 91.15% // Head: 88.96% // Decreases project coverage by -2.19% ⚠️

Coverage data is based on head (ad0aff5) compared to base (8462e59).
Patch coverage: 19.35% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #26      +/-   ##
==========================================
- Coverage   91.15%   88.96%   -2.20%     
==========================================
  Files          12       13       +1     
  Lines         984     1015      +31     
  Branches       48       48              
==========================================
+ Hits          897      903       +6     
- Misses         39       64      +25     
  Partials       48       48              

Impacted Files	Coverage Δ
src/pogonos/api.clj	84.81% <ø> (ø)
src/pogonos/main.cljc	19.35% <19.35%> (ø)

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