docs: adding documentation for programmatic auth feature

googleapis / google-auth-library-nodejs

🔑 Google Auth Library for Node.js

Apache License 2.0

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docs: adding documentation for programmatic auth feature #1790

Closed aeitzman closed 5 months ago

aeitzman commented 5 months ago

Adds code and readme documentation for the programmatic auth feature, as well as additional docs for the options objects used to build external account clients.