about.md added contact information

Author: linkarzu

_tabs/about.md

@@ -27,6 +27,7 @@ title: About Me
 - [Discord server](#discord-server)
 - [Follow me on social media](#follow-me-on-social-media)
 - [A bit about me](#a-bit-about-me)
+- [Contact information](#contact-information)
 
 <!-- tocstop -->
 
@@ -371,3 +372,9 @@ _setapp start date_
   migrated all my notes to Obsidian, so now everything is handled as markdown
   files and automatically uploaded to my private GitHub repo.
 
+## Contact information
+
+- For collaborations or inquiries:
+  - Name: `Christian Arzu`
+  - Email: `[email protected]`
+