feat: pass in custom config file. closes #4

[radiovisual]

Allows users to pass in a custom config file via the --config option.

Example:

keeli --config 'path/to/my/config.json'

Also:

• Makes a few updates to the README
• Adds in the verbose option so that keeli can print the config

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.27%. Comparing base (da06299) to head (d996e8a).

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Additional details and impacted files

@@           Coverage Diff           @@
##             main      #32   +/-   ##
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  Coverage   96.27%   96.27%           
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  Files          28       28           
  Lines         403      403           
  Branches       74       74           
=======================================
  Hits          388      388           
  Misses         13       13           
  Partials        2        2           

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