merge from arlac77/npm-package-template-esm-only

[arlac77]

.npmignore

• chore(npm): merge from template .npmignore

README.md

• docs(README): update from template

[coveralls]

Coverage remained the same at 100.0% when pulling bd8ef58 on npm-template-sync/arlac77/npm-package-template-esm-only into 1bf7cba on master.

[codecov]

Codecov Report

Merging #639 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #639   +/-   ##
=======================================
  Coverage   99.16%   99.16%           
=======================================
  Files           1        1           
  Lines         239      239           
  Branches       19       19           
=======================================
  Hits          237      237           
  Misses          2        2

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