Expand README, add docs contributing guide

[drwpow]

Changes

• Adds guides / READMEs on contributing to documentation
• Expands READMEs to be a little more helpful.

How to Review

Docs-only change.

Checklist

• Unit tests updated
• README updated
• examples/ directory updated (only applicable for openapi-typescript)

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Latest commit: 42945e0

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