adding tutorial for spline#987

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perminder-17 wants to merge 9 commits intoprocessing:2.0from

perminder-17:spline-tutorial

Commits on Oct 6, 2025

adding-tutorial for spline
perminder-17
committed

Commits on Nov 15, 2025

adding the tutorial
perminder-17
committed

Commits on Nov 30, 2025

Improve clarity and structure of spline tutorial
perminder-17
authored