docs: add BibTeX format citation

[lisphilar]

Related issues

Close #1764.

What was changed

Add BibTeX format citations of CovsirPhy and COVID-19 dataset in Japan.

Summary by Sourcery

Documentation:

• Add BibTeX format citations for CovsirPhy and the COVID-19 dataset in Japan to the documentation.

[sourcery-ai]

Reviewer's Guide by Sourcery

The PR adds BibTeX format citations for both the CovsirPhy library and the COVID-19 dataset in Japan. The changes are implemented by adding new sections in the respective README files with properly formatted BibTeX entries that include author information, title, year, URL, and access date placeholders.

No diagrams generated as the changes look simple and do not need a visual representation.

File-Level Changes

Change	Details	Files
Added BibTeX citation format for the main CovsirPhy library	Added a new BibTeX entry with Hirokazu Takaya and CovsirPhy Development Team as authors Included version number placeholder in the title Added URL and access date placeholder in the note field	README.md
Added BibTeX citation format for the COVID-19 dataset in Japan	Added a new BibTeX entry with Hirokazu Takaya as author Included dataset-specific title and URL Added access date placeholder in the note field	data/README.md

Assessment against linked issues

Issue	Objective	Addressed	Explanation
#1764	Add BibTeX citation format to the documentation for referencing the project in academic publications	✅

Possibly linked issues

• [Docs] BibTex Format Citation Request #1764: The PR addresses the issue by adding the requested BibTeX citation format to the documentation.

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[sourcery-ai]

Hey @lisphilar - I've reviewed your changes - here's some feedback:

Overall Comments:

• There's a syntax error in the URLs of both BibTeX entries - an unmatched parenthesis ) that needs to be removed.
• Both BibTeX entries use the same citation key github_repo. Consider using distinct keys (e.g., covsirphy and japan_dataset) to avoid conflicts when citing both sources.

Here's what I looked at during the review

• 🟢 General issues: all looks good
• 🟢 Security: all looks good
• 🟢 Testing: all looks good
• 🟢 Complexity: all looks good
• 🟡 Documentation: 3 issues found

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