Add three new recipes (21 - 23) by 2025 summer student#900

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sadielbartholomew merged 13 commits intoNCAS-CMS:mainfrom

sadielbartholomew:docs-summer-student-2025-recipes

Oct 22, 2025

Commits on Oct 20, 2025

Add 2024 summer placement students to contributors list
sadielbartholomew
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Add all original recipe Python scripts since lost from repo
sadielbartholomew
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