feat: include README and config.yaml.example in package build (Fixes #32)

[KHolodilin]

Description

Ensure that README.md and config.yaml.example are included in the built package distribution:

1. Verify that README.md is correctly included (already configured in pyproject.toml)
2. Add config.yaml.example to package distribution via MANIFEST.in
3. This ensures users have access to documentation and example configuration after installation

Changes

• Created MANIFEST.in to include README.md, LICENSE, and config.yaml.example
• Updated email_processor/cli/commands/config.py to support finding config.yaml.example
• Bumped version to 8.0.5

Testing

• ✅ All tests pass
• ✅ MANIFEST.in created with required files
• ✅ Config command updated to support package file lookup

Checklist

• MANIFEST.in created
• Config.py updated
• Tests pass
• Version bumped (8.0.4 → 8.0.5)
• Code committed
• Branch pushed

Note: Files from MANIFEST.in are included in .dist-info directory. README.md is shown on PyPI, and config.yaml.example will be available in the package distribution.

Fixes #32

[codecov-commenter]

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Codecov Report

✅ All modified and coverable lines are covered by tests.

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