Go Program: Convert Security Audit JSON to Markdown Report

A simple Go program converts `security-audit.json` to `security-audit.md` for use in CI pipelines. An example report is provided, along with example CI integration files (`dependency-audit.yml` and `dependency-audit-only-when-detected.yml`), the latter only creating a GitHub issue if vulnerabilities are detected. The program allows customization of input and output file paths and offers an option to fail if no vulnerabilities are found.