- Introduced arjz.h header file with function declaration for buffer decompression.
- Updated library.h to include ARJ and ARJZ decompression method declarations.
- Added test cases for ARJ decompression methods (Method 1 to Method 4) in arj.cpp.
- Implemented test cases for ARJZ decompression methods in arjz.cpp, including default and custom extended DEFLATE.
- Copied necessary binary test data files for ARJ and ARJZ methods into the tests/data directory.
