docs: add Quaternius to Assets/Placeholders

[HelioASjunior]

Hi! I'm suggesting the addition of Quaternius to the Assets/Placeholders section.

It is a high-quality resource offering thousands of free CC0 low-poly 3D models and animated characters, which is a fantastic alternative for indie developers and Game Jams.

I've ensured it follows the alphabetical order of the current list. Thanks!

Summary by CodeRabbit

• Documentation
  • Added new asset reference to documentation.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 75f7a6ee-0faa-47f0-85c3-09cc3f465832

📥 Commits

Reviewing files that changed from the base of the PR and between 6724cdd and b2d9068.

📒 Files selected for processing (1)

• README.md

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📝 Walkthrough

Walkthrough

The README.md file was updated to include a new asset entry for Quaternius under the Assets/Placeholders section, with an accompanying formatting adjustment to add spacing before the Spritesheet Tools header.

Changes

Cohort / File(s)	Summary
Documentation README.md	Added new Quaternius asset entry with link under Assets/Placeholders; added blank line for formatting before Spritesheet Tools section.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Poem

🐰 A new asset hops into view,
Quaternius joins our treasure brew,
With spacing clean and links so neat,
Our README's documentation's sweet! ✨

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately summarizes the main change: adding Quaternius to the Assets/Placeholders section of the documentation.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

📝 Coding Plan

• Generate coding plan for human review comments

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