initial commit

Summary by Bito

• Introduces intentional bugs and vulnerabilities across multiple modules for testing purposes, posing security risks in user application logic, numerical validations, a broken script, and employee management system.
• Adds new modules including user application logic, numerical validations, a broken script, and employee management system.
• Adds a simple test file.
• Overall summary: Introduces a foundational codebase with new modules (user application logic, numerical validations, broken script, employee management system) and a simple test file, featuring intentional bugs and vulnerabilities for functional validation and review.