Add practical guide to KCNA and KCSA certifications

[Surajtalwar]

Description: A Practical Guide to KCNA and KCSA Certifications

This PR introduces a comprehensive guide for preparing and passing the Kubernetes and Cloud Native Associate (KCNA) and Kubernetes and Cloud Native Security Associate (KCSA) certifications. It provides actionable study strategies, recommended resources, and exam-specific insights for engineers looking to validate their Kubernetes and cloud native security knowledge.

Key Coverage Areas:

• Why These Certifications Matter: Understanding the knowledge gaps they address and their role in the CNCF certification pathway.
• KCNA Deep Dive: Complete domain breakdown (Kubernetes Fundamentals 46%, Container Orchestration 22%, Cloud Native Architecture 16%, Observability 8%, Application Delivery 8%) with prioritized topics.
• KCSA Deep Dive: Security-focused domain coverage (Cluster Component Security 22%, Security Fundamentals 22%, Threat Model 16%, Platform Security 16%, Cloud Native Security Overview 14%, Compliance 10%).
• Recommended Resources: Primary courses (James Spurin for KCNA, Zeal Vora for KCSA) with supplementary materials and hands-on tools (Trivy, Falco, OPA/Gatekeeper, Kubescape, kube-bench).
• Study Strategy: Recommended order (KCNA → KCSA), 4-6 week study plan, and effective learning strategies.
• Exam-Specific Insights: KCNA and KCSA-specific tips beyond generic exam advice.
• Certification Path: Progression from KCNA/KCSA to hands-on certifications (CKA, CKAD, CKS).

PR Checklist:

• Author Attribution: I have been added to the list of authors correctly.
• Asset Management: All images used in the post are located in the assets/ folder.
• Internal Review: This article has undergone internal review before this PR.
• Integrity: I have not modified any previously published articles.
• Local Verification: I have double-checked the changes locally at http://127.0.0.1:4000/ using bundle exec jekyll serve.
• Build Quality: The changes generate no new errors or warnings.