Add docs describing the process of writing a new schema#375

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WilliamJamieson merged 3 commits intospacetelescope:mainfrom WilliamJamieson:feature/schema_docs

Feb 23, 2024

+529-1

Commits on Feb 21, 2024

Commits on Feb 23, 2024

Update based on the review comments
WilliamJamieson
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