Add VulnHawk - AI-powered SAST scanner

Add VulnHawk to the Testing section. It's an AI-powered static
analysis tool that fills the gap between pattern-matching SAST
and manual code review via context-enriched analysis.

Author: momenbasel

README.md

@@ -227,6 +227,7 @@ Testing is an essential element of a DevSecOps program because it helps to prepa
 * [ShiftLeft Scan](https://slscan.io)
 * [Snyk](https://snyk.io)
 * [SourceClear](https://www.sourceclear.com)
+* [VulnHawk](https://github.com/momenbasel/vulnhawk) - AI-powered static analysis tool with context-enriched code review. Supports Python, JS/TS, Go, Java, PHP, Ruby. GitHub Action + CLI with SARIF input/output.
 
 
 ## Alerting