Support Swift Package Manager (aka SPM)

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[codecov]

Codecov Report

Merging #2 (4428f08) into master (789f213) will not change coverage.
The diff coverage is n/a.

❗ Current head 4428f08 differs from pull request most recent head eb81ce0. Consider uploading reports for the commit eb81ce0 to get more accurate results

@@           Coverage Diff           @@
##           master       #2   +/-   ##
=======================================
  Coverage   99.68%   99.68%           
=======================================
  Files          13       13           
  Lines         640      640           
=======================================
  Hits          638      638           
  Misses          2        2           

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