Add Pillow to sprints project list (#1447)

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Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Co-authored-by: Nikoś <[email protected]>

Author: 3 people

src/content/sprints/pillow.md

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+---
+title: "Pillow"
+numberOfPeople: "TBD"
+pythonLevel: "Intermediate"
+contactPerson:
+  name: "Eric Soroos"
+  email: [email protected]
+  github: wiredfool
+  twitter:
+links:
+  - title: "Repo"
+    url: "https://github.com/python-pillow/Pillow"
+  - title: "Issue Overview"
+    url: "https://github.com/python-pillow/Pillow/issues/1888#issuecomment-2613018551"
+---
+
+I'm planning on working on the long-standing Pillow issue #1888 -- high bit
+depth multi channel images, specifically by trying to add planar image storage
+to the core Pillow imaging object.
+[This comment](https://github.com/python-pillow/Pillow/issues/1888#issuecomment-2613018551)
+outlines the general approach that I think would work.
+
+There will be some C level wrangling in addition to the Python layer changes to
+implement the planar image storage.