Add documenation and add `--help` flag
Small typo fix in documentation
Exit with code 3 when request help
Add documenation and add `--help` flag
Add test directory skel
Add bats test helper
Add Makefile with task to run test suite with bats
Add tests to check if help flag return doc and correct exit code
Add test to check if bash scripts executable
Add test to check return code when using unknown flag