Update about.md with personal details and background

Added personal introduction, background, and contact information to the about page.

Author: Denarzai

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+Hi, I'm **Muhammad Subhan** — a third-year BS Cybersecurity student at FAST NUCES Islamabad, Pakistan.
+
+I built this blog to document everything I'm learning as I work toward becoming a competitive cybersecurity professional. That means writeups from platforms like OverTheWire Bandit, TryHackMe, and HackTheBox, alongside concept posts connecting what I study to real-world attacks.
+
+## What I Post
+
+- **CTF Writeups** — step by step walkthroughs of challenges I solve on Bandit, TryHackMe, and HackTheBox
+- **Learning Posts** — concepts from courses like Harvard's CS50 Cybersecurity, explained in plain language with real-world examples
+- **Security Notes** — things I picked up from reading about current breaches and incidents
+
+## Background
+
+My coursework covers x86 assembly, C++ systems programming, networking (OSPF/EIGRP/RIPv2 simulations in Cisco Packet Tracer), and web development with Flask. I'm currently working through OverTheWire Bandit and TryHackMe's Jr Penetration Tester path.
+
+I completed Harvard's CS50 Introduction to Cybersecurity and did my final project on the Salt Typhoon APT — the Chinese state-sponsored attack on US telecoms disclosed in September 2024.
+
+## Find Me
+
+- GitHub: [Denarzai](https://github.com/Denarzai)
+- LinkedIn: [subhan-cybersec](https://www.linkedin.com/in/subhan-cybersec)
+- Email: Sdenarzai786@gmail.com