[rubensdemelo]

Motivation

• Provide a small, easy-to-run CLI example that demonstrates all formatting APIs.
• Remove unnecessary example package metadata and generated files to simplify the repository structure.
• Improve and clarify example usage instructions in Portuguese.

Description

• Add example/brasil_datetime_example.dart which prints all date/time formatter outputs for a sample DateTime instance.
• Remove legacy example package files including pubspec.yaml, pubspec.lock, lib/example.dart, CHANGELOG.md, .gitignore, and analysis_options.yaml to avoid maintaining a separate package layout.
• Replace example/README.md with a concise Portuguese guide showing how to run the CLI demo via dart run example/brasil_datetime_example.dart.
• Normalize the top-level README.md by ensuring a newline at end of file for the contrib.rocks line.

Testing

• No automated tests were run for these documentation and example-only changes.

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Codex Task