Add sheetsmith to Spreadsheet

[BaldiLore]

Suggestion type

• Project
• Resource

Checklist

• I searched the list and existing issues for duplicates.
• I changed README_SOURCE.md, not the generated README.md.
• This pull request contains one suggestion.
• The suggestion is relevant to Java or the JVM and fits its chosen category.
• I used the canonical project or resource link.
• The suggestion is current and maintained.
• The concise, neutral description explains its distinguishing value and ends with punctuation.
• Licensing is clear and any restrictive terms are disclosed where applicable.

About the project

Disclosure: I'm the author.

sheetsmith generates styled XLSX reports from annotated POJOs and records, on top of Apache POI.
Compared to the existing entries in the Spreadsheet section, it focuses on the writing side for reporting use cases:

• declarative styling (header, rows, zebra stripes, first/last row and column) and built-in table presets
• shared styles across sheets, to keep reports consistent with a company look
• fail-fast validation of the annotations at application startup
• a Spring Boot 4 starter with auto-configuration, plus a framework-agnostic core module

Licensed under Apache 2.0. English documentation: https://sheetsmith.baldilorenzo.cloud
Available on Maven Central as cloud.baldilorenzo.sheetsmith:sheetsmith-spring-boot-starter.

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Summary by cubic

Adds sheetsmith to the Spreadsheet section of README_SOURCE.md. The library generates styled XLSX reports from annotated POJOs and records on top of Apache POI, with declarative styling, table presets, and Spring Boot auto-configuration.

^{Written for commit efbf6ea. Summary will update on new commits.}

[cubic-dev-ai]

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