Add WAFtester to Testing section

[Qandil]

Adds WAFtester to the Testing section.

WAFtester is an open-source WAF security testing CLI that:

• Tests WAF rule coverage with 2800+ attack payloads across 18 categories
• Fingerprints 197+ WAF vendors
• Automates bypass discovery with 70+ evasion techniques
• Outputs SARIF, SonarQube, GitLab SAST, and JUnit for CI/CD integration
• Quantitative scoring (F1, MCC, FPR) for WAF effectiveness measurement

It fits the DevSecOps pipeline as a testing tool that can run in CI/CD to validate WAF configurations before and after deployment.

GitHub: https://github.com/waftester/waftester