Add author profile for Sean Lee

Author: CodingRule

data/authors/sean.mdx

@@ -0,0 +1,13 @@
+---
+name: Sean
+displayName: eggswithsoy
+country: Malaysia
+joined: March 2026
+position: Challenge Creator
+avatar: /static/images/avatars/sean.mdx
+bio: Hi I am eggswithsoy. Always looking for ways to contribute to the cybersecurity community. 
+tags: ['web', 'b2r', 'ad']
+links:
+  website: https://www.linkedin.com/in/sean-lee-012947354/
+  github: https://github.com/seanleeys
+---