docs: add Cisco Introduction to Cybersecurity course resource

Added extra free course by CISCO

src/data/roadmaps/cyber-security/content/fundamental-it-skills@oimYzZYFXKjgvc7D4c-2u.md

@@ -4,6 +4,7 @@ Fundamental IT skills form the backbone of cybersecurity proficiency and encompa
 
 Learn more from the following resources:
 
+- [@course@Cisco Networking Academy: Introduction to Cybersecurity](https://www.netacad.com/courses/introduction-to-cybersecurity?courseLang=en-US)  
 - [@article@8 In-Demand IT Skills to Boost Your Resume in 2025](https://www.coursera.org/articles/key-it-skills-for-your-career)
 - [@article@Top IT Skills in Demand](https://www.comptia.org/en/blog/top-it-skills-in-demand)
 - [@article@IT Skills: Definition and Examples](https://www.indeed.com/career-advice/finding-a-job/it-skills)