Add CI/CD

This change adds a complete automated build and deployment pipeline for a Java employee management system. The pipeline automatically validates code quality, builds the application using both Make and Maven tools, runs tests to ensure the software works correctly, packages it into a deployable format, and can deploy it to staging and production environments. It includes security scanning, performance testing, and documentation generation, with the ability to run different steps in parallel for efficiency. The pipeline is configured to trigger on code changes and provides manual controls for deployments to prevent accidental releases to production.