Add .env config file support

[twistedstream]

Proposed Changes

• Add support for using a local .env to drive configuration (vs. having to export variables explicitly)
• Nothing happens if the .env does not exist
• Enhanced README.md to suggest using the .env file

Acceptance Test Output

$ go test ./... -v

...

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[yvovandoorn]

Great addition @twistedstream. Really appreciate the contribution!