This commit adds the ability to detect and flag binary artifacts in git repositories.

Changes:
- Add isBinaryFile() method in FileUtils.java that detects binary files by checking if the first 16KiB contains zero bytes
- Add matchesAnyPattern() method to support pattern-based exclusions
- Add binary-exclude configuration option in dictionary format to whitelist known binary files by name patterns
- Update RunnableSigsLoader to load binary exclusion patterns from dictionary
- Modify RunnableScanner to detect binary files before text scanning and flag them as BINARY_ARTIFACT if not excluded
- Update README.md with documentation and examples for the new feature

The feature allows users to:
1. Automatically detect binary files in repositories (files with zero bytes in first 16KiB)
2. Exclude known/legitimate binary files using regex patterns
3. Get warnings for unexpected binary artifacts that may have been accidentally committed