Add Ruby Getting Started guide

[GregHolmes]

Description

Checklist

• Commits have been rebased.
• Linting has been run against the changed file(s).
• The PR adheres to the writing style guide and contribution guide.

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[m-hulbert]

This is good! Spotted a couple of things running through it though.

Should we add a mention early on (perhaps in the prerequisites?) regarding usage of EventMachine?