docs: refresh README (automated audit)

[rustyorb]

Automated README audit — please review the proposed README before merging.

Generated by [repo-readme-auditor].

Summary by Sourcery

Documentation:

• Expand the README with background on 3I/ATLAS and Avi Loeb's paper, and outline repository contents and contribution guidelines.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Refreshes the README with a more detailed, structured description of the 3I/ATLAS project, including background, contents, and contribution guidelines.

File-Level Changes

Change	Details	Files
Expanded and structured the README to explain the project context, current contents, and how to contribute.	Replaced the brief one-line description with a fuller explanation of 3I/ATLAS and its significance as an interstellar object. Added a Background section describing 3I/ATLAS, its discovery by ATLAS, and Avi Loeb’s role and research focus. Added a Contents section clarifying that the repository currently only contains the README and is a placeholder for future notes and discussion. Added a Contributing section outlining how notes, summaries, and relevant links can be added via pull requests.	README.md

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[sourcery-ai]

Hey - I've reviewed your changes and they look great!

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[Copilot]

Pull request overview

Expands the repository README from a single-line placeholder into a short, structured overview describing the 3I/ATLAS topic, providing background context, and clarifying how to contribute.

Changes:

• Adds a brief description and background section for 3I/ATLAS and Avi Loeb’s paper.
• Adds “Contents” and “Contributing” sections to set expectations for repository usage.

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