Break out integration tests; add more tests

[rcoy-v]

Changes

• Break out single integration test to separate areas of functionality.
• Consolidate global setup into TestMain.
• Add more tests.
• Mark TODO tests for functionality not yet implemented.
• Add more information and badges to README.
• Specify version of Go used to run integration tests in CI.

[codecov[bot]]

Codecov Report

Merging #16 (0e6dd16) into main (10fa06e) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##             main      #16   +/-   ##
=======================================
  Coverage   80.03%   80.03%           
=======================================
  Files           2        2           
  Lines         511      511           
=======================================
  Hits          409      409           
  Misses         79       79           
  Partials       23       23           

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