Add nullsec-k8sscan to Kubernetes section

[bad-antics]

Description

Adding nullsec-k8sscan to the Kubernetes security tools section.

About nullsec-k8sscan

A Kubernetes security scanner that audits:

• RBAC policies - Identifies overly permissive roles and risky bindings
• Network policies - Detects missing or misconfigured network segmentation
• Pod security - Checks for privileged containers, host namespaces, capabilities
• Secrets management - Finds exposed secrets and insecure configurations

Complements existing tools like KubiScan, Kubeaudit, and kube-bench with focused configuration scanning.

Checklist

• Clear description
• Active project
• Security tool
• Open source
• Follows library style

Thank you for maintaining this excellent DevSecOps resource!