test: add more build assertions.

[knightedcodemonkey]

• Add more test assertions to a successful build.
• Update README.
• Improve spacing in --help output.

[codecov]

Codecov Report

Merging #4 (c9e27d4) into main (b16bb2e) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main       #4   +/-   ##
=======================================
  Coverage   96.00%   96.00%           
=======================================
  Files           3        3           
  Lines         250      250           
=======================================
  Hits          240      240           
  Misses         10       10           

Files Changed	Coverage Δ
src/init.js	100.00% <100.00%> (ø)

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