Added some details to options documentation

[sseraj]

Purpose

I added some details to the options documentation which will hopefully help users understand how to use certain options.

I also added the Codecov badge to the README because I forgot to do that in #48.

Type of change

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (non-backwards-compatible fix or feature)
• Code style update (formatting, renaming)
• Refactoring (no functional changes, no API changes)
• Documentation update
• Maintenance update
• Other (please describe)

Testing

Checklist

• I have run flake8 and black to make sure the code adheres to PEP-8 and is consistently formatted
• I have run unit and regression tests which pass locally with my changes
• I have added new tests that prove my fix is effective or that my feature works
• I have added necessary documentation

[codecov]

Codecov Report

Merging #55 (affc929) into master (fbfb428) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #55   +/-   ##
=======================================
  Coverage   76.37%   76.37%           
=======================================
  Files           3        3           
  Lines         364      364           
=======================================
  Hits          278      278           
  Misses         86       86           

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